电动机正反转
generator working in double direction
the positive and negative rotary of motors
电机正反转
Electric motor revolution and connter revolution
正反转定幅筘整经
the warping with circumrotating reed
正反转改造
modification of forward and backward rotation circuit
正反转构造
Positive inverted structure
positive inversion structure
positive inversion structures
正反转控制
Positive and negative rotation control
正反转原理
positive and reverse rotation theory
负反转正断层
negative inverted normal fault