Tools for working in the hand, pneumatic and hydraulic and with self-contained electric or non-electric motor.
手提式风动或液压工具及本身装有电动或非电动动力装置的手提式工具。
2
Find something that makes a very quiet, steady sound. A small fan on a low setting or a real, non-electric, ticking watch or clock are ideal.
找一些安静、稳定的东西，一台低音的小风扇，一只电子手表或钟是一个很好的选择。
3
The link and explosion transmission of non-electric detonator network were analyzed and the cause of misfire during underwater reef blasting with the network was found out.