混凝土的厚度如达不到设计要求，将会影响结构的整体强度及其耐久性。
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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
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
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
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