【单选题】可以是轮毂在轴上滑动,并传递较大扭矩的场合的是( )
【单选题】可以是轮毂在轴上滑动,并传递较大扭矩的场合的是 ( )
【简答题】电压负荷工作制分为长时工作制、 _____ 和 _____ 两种。
【简答题】阅读下列短文,做出正误判断,判断正(A)误(B)。 Tom is a student. He is always absent-minded(心不在焉的)in class. His father and mother always tell him to listen to the teacher carefully in class. 'Don't be abset-minded aga...