friction gear是什么意思

用法例句

The sensors including integrated MEMS sensors,tire tread impedance sensors,ultrasonic sensors,electromagnetic sensors,wireless passive surface acoustic wave sensors and virtual sensor were introduced,and their present development,and their working principles,advantages and disadvantages were described in detail.

介绍了目前研究较多的集成MEMS传感器、胎面阻抗传感器、超声波传感器、电磁传感器、无源无线声表面波传感器和虚拟传感器的发展,阐述了工作原理和优缺点。