题目内容

额定速度为0.5m/s,名义宽度为800mm的自动扶梯,其理论输送能力为()人/h。

A. 4500
B. 10125
C. 8775
D. 6750

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After an explosion,repair of emergency machinery and services should be accomplished().

A. after control of fire,flooding,and structural repairs
B. immediately,before the emergency is under control
C. after control of fire,but before control of flooding
D. after stability is restored

影响单轴抗压强度的因素有哪些?

装有254×254密封制动缸活塞行程(有闸调器)重车位为()。

A. 115~135mm
B. 115~160mm
C. 130~150mm
D. 130~160mm

若要求水平角观测6个测回,则下列哪些值可能为配置度盘数()

A. 0度
B. 30度
C. 60度
D. 180度

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