总风压力经过减压阀减压至()后,输入至空气悬挂装置。
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在消防上,当管径小于等于DN50时,采用()连接。
A. 焊接
B. 法兰
C. 螺纹
D. 承插
Which action(s)should the operator of a pedestal crane take if crane control is lost ().
A. Let go of both control levers and return to neutral position
B. Press the emergency stop
C. Notify the mate on watch
D. All of the above