找考题网-背景图
单项选择题

A.不大于4.5sB.不大于5.4sC.不大于4.0sD.不大于5.0sDSA200型受电弓的升弓时间有何要求……

DSA200型受电弓的升弓时间有何要求?()

A.不大于4.5s
B.不大于5.4s
C.不大于4.0s
D.不大于5.0s