Quadrupole mass spectrometer can be used in measuringpressure of dividing and analysis composition of material.
四极质谱计在真空技术中可用来测量分压强，从事物质成分的分析。
2
The system consists of the transmitting and receiving ultrasonic, measuringpressure, collecting data, and controlling of Single Chip Micyoco and PC mainly.
系统主要包括超声波发射接收部分、压力测量部分、数据采集部分、单片机及上位pc机控制部分。
3
This paper establishes the mathematics model and carries out theory 's analyses for measuringpressure of hydraulic system by ultrasonic based on examinations.