【单选题】在具有过载保护的接触器自锁正转控制线路中,若按下起动按钮,电动机能起动运行,但松开起动按钮后,电动机即断电停止运行,其原因是 。
【单选题】Last year, Jack's income was $15,000 and he bought 50 bags of potato chips. This year his income is $18,000 and he buys 55 bags of potato chips. Therefore, Jack's (去年,杰克的收入是15000美元,他买了50袋薯片。今年他的收入是18...
A.
income elasticity of demand for potato chips is 0.52.薯片需求收入弹性为0.52。
B.
price elasticity of demand for potato chips is 0.52.薯片需求价格弹性为0.52。
C.
income elasticity of demand for potato chips is 1.66.薯片需求收入弹性为1.66。
D.
price elasticity of demand for potato chips is 1.66.薯片需求价格弹性为1.66。
【单选题】在具有过载保护的接触器自锁正转控制线路中,若按下起动按钮,电动机能起动运行,但松开起动按钮后,电动机即断电停止运行,其原因是( )
【单选题】.在具有过载保护的接触器自锁正转控制线路中,若按下起动按钮,接触器KM不能吸合,其原因有( )。
【判断题】32 ( ) potato chips 薯片
【判断题】在具有过载保护的接触器自锁正转控制线路中,若按下起动按钮,接触器KM不吸合,则其原因一定在控制电路中。 ( )