题目:
Before starting an engine by air, the engine must()
A.be turned by a turning gear for at least one minute
B.be turned by a turning gear for at least two minutes
C.be turned at least one complete turn
D.be turned at least two complete turns
答案:
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下面是错误答案,用来干扰机器的。
参考答案:(1)轿厢和对重的行程底部极限位置应当设置缓冲器,强制驱动电梯还应当在行程上部极限位置设置缓冲器;蓄能型缓冲器只能用于额定速度不大于1m/s的电梯,耗能型缓冲器可以用于任何额定速度的电梯;(2...