单词 | field analysis | ||||||
释义 | field analysis
例句释义: 现场分析,力场,场地分析法 1. In other words, the ground work of this paper is to achieve transient thermal field analysis with Finite Element Method of Lines. 本文继续将有限元线法延伸到瞬态温度场分析领域中。 www.fabiao.net 2. The sound intensity method is an effective method in noise source identification and acoustic field analysis. 声强测试分析方法是一种有效的噪声源识别和声场分析方法。 www.ceps.com.tw 3. The structural parameters of the valve and the performance parameters of the pump are optimized from flow field analysis perspective. 从流场分析的角度对泵阀的结构参数和泵的性能参数进行了优化。 paper.pet2008.cn 4. Force field analysis Force field ? ? Fractional factorial design ? 部分实施因子设计法 wenku.baidu.com 5. The 3D microwave filter was simulated and optimized by the electromagnetic field analysis software and gained a finer result. 利用电磁场分析软件对三维微波滤波器进行了模拟和优化,得到了较好的结果。 epub.cnki.net 6. Inner steady temperature field analysis is the key part of product reliability design. 其内部稳态温度场分析是产品可靠性设计中的关键环节之一。 www.dictall.com 7. Firstly, SRM magnetic field analysis is performed to get the flux density waveforms in motor core. 本文首先对SR电机的磁场进行了有限元分析,得到了电机铁心各点的磁通密度波形及变化规律。 www.lw23.com 8. Therefore the magnetic field analysis as for the drive coil is necessary. 因此,对于驱动线圈的磁场分析是必要的。 stae.com.cn 9. First of all, based on the field analysis of very soft coal fully mechanized face immediate roof and the movement of top coal. 首先,根据现场实际分析极松软煤层综放工作面直接顶和顶煤的运动形式; paper.pet2008.cn 10. Feasibility study of the application of numerical manifold method in crustal deformation field analysis 数值流形法在地壳形变场分析中的可行性研究 www.ilib.cn 1. Quantitative structure-activity relationship of the inhibitors of acetylcholinesterase by comparative molecular field analysis 乙酰胆碱酯酶抑制剂定量构效关系的比较分子场分析 www.ilib.cn 2. Magnetic Field Analysis and Electromagnetic Force Calculation of a New-type Segments Spray Cooling Electromagnetic Valve 一种新型分段冷却电磁阀的磁场分析和吸力计算 ilib.cn 3. The Flow Field Analysis and Performance Study of the Air Turbo Classifier 涡轮式气力分级机流场的理论分析与计算 www.ilib.cn 4. torque converter; flow field analysis; numerical simulation; performance prediction; unsteady; grid interfaces; 液力变矩器;流场浅析浅析;数值模拟;性能预测;非稳态;滑移网格; www.zidir.com 5. Heating Design and Thermal Field Analysis by Means of FEM for Mold in Powder Warm-Compacted Equipment 粉末温压中模具的加热设计及有限元热场分析 www.ilib.cn 6. The Flow Field Analysis and Performance Study of A New Air Classifier 离心气力分级机的流场分析和性能研究 www.ilib.cn 7. Structural Analysis Thermal Analysis Fluid Dynamic Analysis Electric Field Analysis Magnetic Field Analysis Coupled-field Analysis 學科領域??????結構分析熱傳分析流場分析電場分析磁場分析耦合場分析 wenku.baidu.com 8. Electric field analysis of a sort of all-fiber Pt 一种全光纤电压互感器的电场分析 www.ilib.cn 9. Magnetic Field Analysis of a Switched Reluctance Generator Applied in the Automobile 汽车开关磁阻发电机的磁场分析 www.ilib.cn 10. Electromagnetic Field Analysis and Measurement of the High Speed Normal Magnetic Levitation Vehicle System 常导高速磁悬浮列车电磁场的分析与测量 ilib.cn 1. Substance-field Analysis Based Design Study of the Servo Oil Cylinder 基于物场分析的伺服液压缸设计研究 www.ilib.cn 2. Stress Field Analysis on the Rock Mass of the Prestressed Anchor Cable and Its Application 锚索应力场分析及其应用研究 www.ilib.cn 3. Near Field Analysis and Application of a New Type Antenna for Radio Frequency I dentification 一种新型射频识别天线的近场分析及应用 service.ilib.cn 4. Application of field analysis method and impedance superposition method in gap-impedance calculation of klystron output circuit 场分析法与阻抗叠加方法在速调管输出腔间隙阻抗计算中的应用 www.ilib.cn 5. Application of Visualization Technology in Pre-processing and Post-processing of Three-Dimensional Magnetic Field Analysis 可视化技术在三维磁场分析软件前后处理中的应用 www.ilib.cn 6. Three-dimensional Magnetic Field Analysis and Optimum Design of Electromagnetic System for Micro-electro-mechanical Relay 微机械电磁继电器三维磁场分析及其电磁系统优化设计 ilib.cn 7. Flow Field Analysis of the Chemical Reaction of High-temperature Air in a Plasma Generator 等离子体发生器内高温空气化学反应流场分析 www.ilib.cn 8. Electric field analysis of an optical potential transformer structure 一种光学电压互感器结构的电场分析 www.ilib.cn 9. Electromagnetic Field Analysis of Magnetic Saturation Characteristics of Bearingless Switched Reluctance Motor 无轴承开关磁阻电机磁饱和特性的电磁场分析 168.160.184.78 10. Application Comparison between Magnetic Field Analysis and Analytic Methods in Transformers 变压器磁场分析法与解析法的应用对比 www.ilib.cn 1. Particle image velocimetry techniques used in blood flow field analysis 血流场显示测速技术 www.malagaq.cn 2. Electromagnetic Field Analysis and Numerical Calculation of One-dimensional Magneto-photonic Crystal 一维磁性光子晶体的电磁场分析和数值计算 www.ilib.cn 3. Design and Flow Field Analysis of a New-type Combustor Generating Inert Gas by Fuel Burning 新型燃油惰气发生器燃烧室的设计及流场分析 www.ilib.cn 4. Field Analysis Method-A New Method for Calculating the Characteristic Parameters of the Output Circuit in the Klystron 场分析法——计算速调管输出回路特性参数的一种新方法 service.ilib.cn 5. Fluid field analysis of high pressure throttle valve and its structure improvement 高压节流阀流场分析及其结构改进 ilib.cn 6. Electromagnetic Field Analysis and Magnetic Force Calculation of Contactor with Permanent Magnet 单线圈单稳态永磁机构接触器三维磁场分析和电磁吸力的计算 service.ilib.cn 7. Temperature field analysis of concrete filled steel tube under high temperature by nonlinear finite element analysis 高温下钢管混凝土温度场的非线性有限元分析 scholar.ilib.cn 8. Equivalent Temperature Field Analysis for a Liquid Floated Gyro 某型液浮陀螺仪定位壳体温度场有限元分析 service.ilib.cn 9. Application of Field Analysis Based FCE Model to Technical Innovation Assessment of Construction Machinery 基于场分析的FCE模型在工程机械技术创新评价中的应用 www.ilib.cn 10. Finite Element Magnetic Field Analysis of the Typical Magnetic Fluid Sealing Structure 典型磁流体密封结构磁场有限元分析 ilib.cn 1. Strain field analysis of weld with trailing impact rolling to control residual stress and distortion and prevent hot cracking 随焊冲击碾压减小应力变形防止热裂纹应变场分析 www.ilib.cn 2. Magnetic field analysis and magnetic circuit concept design of electromagnetic thrust bearing 电磁推力轴承的磁场分析及磁路概念设计 www.ilib.cn 3. Design and Realization of a Signal Frequency-field Analysis and Processing System Based on Virtual Instrument 基于虚拟仪器的信号频域分析与处理系统的设计与实现 www.ilib.cn 4. Electric-thermal field analysis in cable terminations equipped with nonlinear stress control tubes 含非线性应力管的电缆终端的电-热场分析 www.ilib.cn 5. Transient temperature field analysis of the dynamic-gyroscope bracket 动调陀螺减振器的瞬态温度场分析 168.160.184.82:8080 6. Segmentation of Ultrasonic Image Using Getting Optimal Threshold by Frequency field Analysis 用频域分析最佳阈值的方法进行超声医学图像分割 www.ilib.cn 7. Overview of FEM Temperature Field Analysis and Thermal Stress Fields Analysis Technique for Refractory 耐火材料有限元热分析与热应力分析研究进展 www.ilib.cn 8. Velocity Field Analysis for Correcting Model of Exponential Viscosity under Thin Film Lubrication 薄膜润滑条件下指数粘度修正模型的速度场分析 ilib.cn 9. suction chamber; three-dimensional modeling; velocity flow field analysis; 半螺旋形吸入室;三维模拟;速度流场分析; dictsearch.appspot.com 10. The Method Study of Fast Field Analysis of Dissolved Phosphate 现场快速分析溶解性磷酸盐的方法研究 service.ilib.cn 1. Temperature Field Analysis and Phase Transformation Research in Grind-Hardening 磨削淬火技术的温度场分析和材料相变研究 www.ilib.cn 2. The copper plate's thermal field analysis of a continuous caster 连铸机结晶器铜板温度场分析 service.ilib.cn 3. Design method and magnetic field analysis of axial-magnetized permanent magnet micromotor 轴向磁化永磁微电机磁场分析及设计方法研究 www.ilib.com.cn 4. Three Dimensional Field Analysis of Single-Phase Three-Limb Power Transformer Under Direct Current Bias 直流偏磁条件下单相三柱电力变压器三维磁场分析 service.ilib.cn 5. New Method for Coupled Field Analysis in Transverse Flux Induction Heating of Continuously Moving Sheet 连续运动薄板横向磁通感应加热耦合场分析新方法 ilib.cn 6. Flow Field Analysis of an Electrostatic Cyclone Separator 静电旋风分离器的流场分析 ilib.cn 7. Three-dimensional temperature field analysis in aircraft structure 飞机结构三维温度场分析程序 www.ilib.cn 8. Magnetic field analysis of straight pillared Electro-Magnetic gears by ANSYS finite element method 基于ANSYS有限元方法对直齿圆柱电磁齿轮磁场的分析 ilib.cn 9. Harmonic Magnetic Field Analysis of Brushless Doubly-Fed Machines for Adjustable Speed Drives 无刷双馈调速电机的谐波磁场分析 ilib.cn 10. Temperature Analysis of Axial Ventilation Cooling Motor Rotor with Flow Field Analysis Method 流场分析轴向通风冷却电机的转子温度 www.ilib.cn 1. Temperature Field Analysis of Concrete Filled Circular Steel Tubes in Fire by Finite-Difference Method 四面均匀受火下圆钢管混凝土温度场非线性分析 www.ilib.cn 2. Characteristic parameters in klystron output circuit by field analysis method 用场分析法求解速调管输出回路特性参数 www.ilib.cn 3. Flow field analysis and structure optimizing for rotary valve of hydraulic steering control units 全液压转向器流场分析及其结构改进 www.ilib.cn 4. Finite Element Magnetic Field Analysis and Control Unit Design of Permanent Magnet Contactor 永磁接触器磁场有限元分析及控制单元设计 ilib.cn 5. Application of Mapping Results onto a Path in Coupled-field Analysis of Temperature Field and Thermal Stress 路径映射在温度场及应力场耦合分析中的应用 service.ilib.cn 6. Flow field analysis on the characteristic of a high load compressor fan 高负荷风扇级的特性实验与流场分析 www.ilib.cn 7. Study on force density function and stress field analysis of the waved-edge milling insert 波形刃铣刀片受力密度函数的研究及其应力场分析 service.ilib.cn 8. Study on QSAR of chlorophenol compounds with comparative molecular field analysis 应用比较分子力场分析法研究氯代苯酚化合物结构与活性的相关性 www.ilib.cn 9. Three-dimensional Temperature Field Analysis of Hybrid Journal Bearing 动静力混合润滑轴承三维温度场的研究 ilib.cn 10. Field Analysis and Investigation of Defects in Electrophoresis Coating 电泳涂装缺陷的分析与处理 www.ilib.cn 1. New preconditioning solutoin for large real sparse symmetric linear systems in electromagnetic field analysis 电磁场分析中大型实稀疏对称方程组的新的预处理解法 www.ilib.cn 2. Cavitation Observation and Flow-field Analysis of High-speed Flow inside Throttling Groove 阀口高速流动中的气穴观测与流场分析 www.ilib.cn 3. Focal field analysis for elliptically polarized front-fed reflector antenna 椭圆极化前馈抛物面天线的焦场分析 ilib.cn 4. Magnetic field analysis and parameter calculation of linear wave power generator 永磁直线波力发电机的磁场分析与参数计算 www.ilib.cn 5. Flow Field Analysis and Structure Optimization of Diesel Engine Exhaust Manifold 柴油机排气歧管流场分析与结构优化 www.ilib.cn 6. Three- Dimensions FEM Simulation Coupled - Field Analysis of Fluid in Casting Mouth with ANSYS 基于ANSYS的铸嘴熔体耦合场三维有限元仿真分析 service.ilib.cn 7. Power Frequency Electric Field Analysis of UHV Double-Circuit AC Transmission Lines on the Same Tower 特高压同塔双回交流输电线路工频电场分析 www.ilib.cn 8. Far-field analysis of effects of bilateral rupture fault on space correlation of strong ground motion 双侧破裂模型对地震动空间相关性影响的远场分析 service.ilib.cn 9. The temperature field analysis on a type of new slide rail in heating furnace 加热炉新型热滑轨的温度场分析 service.ilib.cn 10. Three-dimensional Flow Field Analysis of the Stator in Transonic HTA Turbine 跨声速HTA涡轮导向器全三维流场计算分析 www.ilib.cn 1. Momentum and Flow Field Analysis of Tiny-hole Jet-flow in High-pressure Homogenization Processing 微孔射流高压均质过程动量及流场结构分析 service.ilib.cn 2. Magnetic field analysis and electromagnetic force calculation for electromagnetic valves based on finite element method 电磁阀的有限元法磁场分析及吸力计算 www.ilib.cn 3. Electromagnetic field analysis on suspension magnet of EMS maglev vehicle 常导磁悬浮车悬浮电磁铁的电磁场分析 www.ilib.cn 4. Focal Field Analysis for Front-Fed Circularly Polarized Reflector Antenna 前馈圆极化反射面天线的焦场分析 www.ilib.cn 5. Magnetic field analysis for magnetic suspension momentum wheel with ANSYS 利用ANSYS软件进行磁悬浮动量轮的磁场设计 www.ilib.cn 6. Wave Superposition Based Acoustic Field Analysis and Computing 基于波叠加原理的辐射声场的计算研究 ilib.cn 7. Electric magnetic field analysis of a kind of magnetic suspension platform 一种磁悬浮平台的电磁场分析 www.ilib.cn 8. An Enhanced Molecular Field Analysis Method Using Genetic Algorithm 基于遗传算法的分子场分析方法研究 www.ilib.cn 9. Dynamic Meshing for Circuit-field Analysis of Inverter-driven Induction Motor 变频调速异步电机场路分析中的动态网格剖分 www.ilib.cn 10. Force-field analysis: analyzing positive and negative factors 力场分析:分析积极和消极的因素 www.ilib.cn 1. Design and Flow Field Analysis for a Core Engine Exit Strut 某核心机出口整流支板设计和流场分析 www.ilib.cn 2. Far-field analysis of ultrashort pulse through the tiled gratings 超短脉冲通过拼接光栅的远场分析 service.ilib.cn 3. Substance-Field Analysis and Application of the Plane Design 物场分析法及其在平面设计中的应用 www.ilib.cn 4. Recent Progress in Comparative Molecular Field Analysis 比较分子场分析方法研究的最新进展 www.ilib.cn 5. Wide Angle Seismic Wave Field Analysis and Imaging Method Below the High Velocity Shield Layers 高速屏蔽层下广角地震波场分析及成像方法 www.ilib.cn 6. Tectonic Stress Field Analysis and Its Influence in Handan-Fengfeng Mining Area 邯郸-峰峰矿区构造应力场分析及其影响 www.ilib.cn 7. Temperature Field Analysis on a Type of Floated Gyro Floater Structure by Using AWE Software 利用AWE分析三浮陀螺浮子结构温度场 service.ilib.cn 8. Temperature Field Analysis of Structures in Port Engineering 港口工程建筑物的温度场分析 www.ilib.cn 9. Stress Field Analysis for Infinite Plate with Rectangular Opening 无限平面矩形开孔的应力场分析 ilib.cn 10. The Modified Solutoin for Large Sparse Symmetric Linear Systems in Electromagnetic Field Analysis 电磁场分析中大型稀疏对称线性方程组的一种改进解法 www.ilib.cn 1. The Flow Field Analysis of Unfold Course for Solid Rocket Engine with Extendible Nozzle 带有延伸喷管的固体火箭发动机展开过程的流场分析 www.ilib.cn 2. Three-Dimensions FEM Simulational Coupled-Field Analysis of the Fluid in the casting mouth with ANSYS 基于ANSYS的铸嘴流体耦合场三维有限元仿真分析 service.ilib.cn 3. Attempt at using infinite element method in dam temperature field analysis 无限单元法在坝体温度场分析中的尝试 www.ilib.cn 4. Flow Field Analysis and Structure Optimization of PEM Fuel Cell Air Inlet Manifold PEM燃料电池进气箱的流场分析与结构优化 ilib.cn 5. Stress Field Analysis with Deformation Ellipse Method 应用变形椭圆法进行应力场分析 www.ilib.cn 6. Three-dimensional Flow Field Analysis For Last Stage in Air Cooling Steam Turbine 空冷汽轮机末级叶片的三维流场分析 ilib.cn 7. Magnetic Field Analysis of Bearingless Induction Motor Using Finite Element Analysis 无轴承异步电机的最大径向力有限元分析 www.ilib.cn 8. Force Field Analysis: Have the group brainstorm two lists: (1) forces that are "driving" for change; 说服力分析:做两个团队集体讨论的清单:(1)说服力是改变的驱动; www.lwtxw.com 9. Velocity Field Analysis under the Condition of Continuous Viscosity Variation 连续粘变条件下的速度场分析 www.ilib.cn 10. Kurt Lewin's Force Field Analysis, Force Field Analysis, Force Field Diagram 卢因的力场分析法,库尔特·卢因的力场分析法,力场分析法,力场分析图,卢因的力场分析,力场分析 my.kmcenter.org 1. Sound Field Analysis and Application of VirtualSound Reproduction System 虚拟声重发系统的声场分析及应用 www.ilib.cn 2. Electric Field Analysis of Four-Phase Power Transmission Lines 四相输电线路附近的电磁场辐射分析 www.ilib.cn 3. Review of Nonthermal Plasma Reactors and Its Electric Field Analysis 放电等离子体反应器装置及其电场分析评述 ilib.cn 4. Temperature Field Analysis of Heat of Hydration in Concrete Box Girder 混凝土箱形梁水化热温度场分析 service.ilib.cn 5. Distant Field Analysis of Bubble Interference 气泡干涉的远场分析 service.ilib.cn 6. Flow Field Analysis of High Pressure Turbine Stage with Cooling Flows 带冷气影响的某高压涡轮级流场分析 www.ilib.cn 7. Comparative Molecular Field Analysis of Non-peptidic Inhibitors of Thrombin 非肽类凝血酶抑制剂的比较分子力场分析 scholar.ilib.cn 8. Two Dimensional Current Field Analysis of Huanghua Port 黄骅港海域二维流场分析 www.ilib.cn 9. Symbiotic Philosophy Based on the Architecture Field Analysis To Explain Kant's Hometown Architecture 基于建筑场的共生哲学分析——兼看康德故乡的建筑 service.ilib.cn 10. Stress field analysis of brazed joint between diamond and hard alloy 金刚石与硬质合金钎焊接头应力场分析 www.ilib.cn 1. Therm-structure-coupled Stress Field Analysis on Mixer 混铁炉热与结构的耦合应力场分析 www.ilib.cn 2. Parallel Computation of Flow Field Analysis and Design 流场分析和设计的并行计算 www.ilib.cn 3. Magnetic field analysis of linear induction motor 直线感应电机的磁场分析 ee.zju.edu.cn 4. Structure design and magnetic field analysis of vane MRF damper 叶片式磁流变液减振器的结构设计及磁场分析 www.ilib.cn 5. Coupling Field Analysis and Application for Cylinder Head of Diesel Engine 柴油机气缸盖的耦合场分析及应用 www.ilib.cn 6. Substance-field Analysis for Product Design 产品设计中的物质-场分析 www.ilib.cn 7. Heat-elasticity Coupling Field Analysis of Blade 叶片热弹耦合场分析 ilib.cn 8. Stable Field Analysis of Aircraft Flying at High Angles of Attack 飞机大攻角俯仰飞行的稳定域分析 www.ilib.cn 9. Stress field analysis at notch of standard impact test sample by fem 标准冲击试样缺口应力场有限元分析 service.ilib.cn 10. Transient field analysis for series MEMS switch 串联MEMS开关的瞬态电磁场分析 www.ilib.cn 1. Design and Field Analysis of PMMA Rib Optical Waveguides PMMA脊形光波导的设计与场分析 ilib.cn 2. Seepage Field Analysis of the 6th Dam Block Foundation of Baise Gravity Dam 百色水利枢纽重力坝6号坝段基础渗流场分析 ilib.cn 3. Stress Field Analysis of Interaction of Rock Cracks 岩石裂纹相互作用的应力场分析 www.ilib.cn 4. Development of Electromagnetic Field Analysis Software of Switched Reluctance Motors Based on ANSYS Platform 基于ANSYS平台开发开关磁阻电机电磁分析软件 www.ilib.cn 5. Sound Field Analysis on Thrust Chamber of Liquid Rocket 液体火箭发动机推力室内声场分析 www.ilib.cn 6. The Flow Field Analysis of Super-fine Powder Jet Classifier 超细粉射流分级机流场分析 service.ilib.cn 7. Brushless DC Motor Magnetic Field Analysis Based on Equivalent Magnetic Network Model 基于等效磁网络模型无刷直流电动机磁场分析 service.ilib.cn 8. Seepage field analysis for water burst of roof on working face 采场工作面顶板突水的渗流场分析 www.ilib.cn 9. Transient Temperature Field Analysis of Vehicle Disc Brake Based on Finite Element Method 基于有限单元法的客车盘形制动盘瞬态温度场分析 www.ilib.cn 10. Research on method of product failure anticipation based on reverse substance-field analysis 基于物场分析逆用的产品失效预测方法研究 service.ilib.cn 1. Magnetic Field Analysis of Force Motor with Moving Coil Based on NdFeB Permanent Magnet Material 基于NdFeB永磁材料的动圈力马达磁场分析 www.ilib.cn 2. In Site Stress Measurement and Stress Field Analysis of Donghuantuo Mine 东欢坨矿地应力测量及应力场分析 www.ilib.cn 3. Pressure Field Analysis of Dust Explosion in Free Air 自由空间粉尘云雾爆炸压力场分析 www.ilib.cn 4. Structure Design of Catalysts Gas for Discharge Plasma Based on Electric Field Analysis 放电等离子体用催化剂结构设计中的电场分析 www.ilib.cn 5. Near-field analysis of SIL for double layer data storage 用于双层存储的SIL近场分析 www.ilib.cn 6. Stress Field Analysis of Surrounding Rock Mass of Tunnel Based on Isotropic Elastic Damage 基于各向同性弹性损伤的巷道围岩应力场分析 www.ilib.cn 7. The three-dimensional magnetic field analysis in the contact system of intelligent AC contactor 智能交流接触器触头系统三维磁场分析 ilib.cn 8. Moving target tracking based on optical flow field analysis in complex background 基于光流场技术的复杂背景下运动目标跟踪 service.ilib.cn 9. The Near-Field Analysis of Thin Helical Antenna 细螺旋天线的近场分析 service.ilib.cn 10. Flow Field Analysis for Raw Water Poppet Valve by Using ANSYS 用ANSYS对海、淡水液压锥阀的流场解析 ilib.cn 1. The Well-bottom Fluid Field Analysis of One-cone Bit 单牙轮钻头井底流场的分析 ilib.cn 2. A Product Creative Design Model Based on Substance Field Analysis 基于物场分析法的创新模型 www.wanfangdata.com.cn 3. Electromagnetic Field Analysis for TA Type Super-RENS in Optical Storages 孔径型超分辨近场结构光盘的电磁场分析 www.ilib.cn 4. Air-gap Field Analysis of PM Motor Based on Magnetic Equivalent Circuit 基于等效磁网络模型的永磁电机气隙磁场的分析 www.ilib.cn 5. A Displacement of Building Cluster Based on Field Analysis 基于场论分析的建筑物群的移位 www.ilib.cn 6. Active Contour Models Based on Force Field Analysis 基于力场分析的主动轮廓模型 www.ilib.cn |
||||||
随便看 |
|
英汉双解词典包含2704715条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。