This is because the current the electrodes detect is weak, and a really good contact needs to be made between apparatus and skin.
这是由于电极要探测的电流非常弱，仪器与皮肤需要非常好的接触。
2
TJC contact net measuring apparatus USES supersonic, electronic, optical and mechanical methods to measure the height and pulling_out value of electrical engine contact net.
接触网测量仪采用超声、电子、光学、机械等手段测量电力机车接触网的高度和拉出值。
3
Non-contact explosion mainly causes destruction to a warship's structure, apparatus and equipments.