two-throw switch两掷开关
two-step throw两步投球
two-throw crankshaft双弯曲轴;双拐曲轴
two-throw pump二拐曲柄泵
two-throw crank双拐曲柄
two-throw w pump双吸泵
two-throw crank detail双拐曲柄
two-throw crank shaft双拐曲轴
double-suction pump two-throw pump双吸泵
two throw crank-shaft双拐曲柄轴