专门用于重复短时运行的交流异步电动机重复运行周期不大于()。
(A)5min
(B)10min
(C)15min
(D)30min
参考答案:B
V带和平带相比,最主要的特点是()
A.传动效率高
B.传动能力强
C.传动比准确
D.圆周速度高
There is nothing more I can try _______you to stay, so I wish you good luch.
A.being persuaded
B.persuading
C.to be persuaded
D.to persuade