Based on the fracture site investigation and macro-rod fracture analysis, the welding rod fracture occurred in the vicinity of the weld fusion line.
通过对最近的一次断裂拉杆现场调查和宏观断口分析，发现断裂发生在拉杆的补焊焊缝熔合线附近。
2
The characteristic impedance of unscreened slab-line is obtained, based on the investigation of the properties of the equipotential line in vertical stripline.
本文通过保角变换研究了垂直带状线中等位线的特性，结果表明其中有一根非常近似于圆的等位线。
3
Investigation reveals that on-line communication is a new way of interpersonal communication. If applied well, it will be a positive stimulant for the growth of university students.