只有美国消防员和维修人员有密码或者特殊的钥匙时，他们才能按按钮加速关门的过程。
Only US firefighters and repairmen can use the buttons to speed up the door-closing process if they have a code or special keys.
原件日下午12 / 12型冲锋枪功能的单独的手动安全和消防模式选择，无论是在形式的跨螺栓按钮了。
Original PM 12 / Model 12 submachine guns featured separate manual safety and fire mode selector, both being made in the form of the cross-bolt buttons.
阐述了消火栓按钮在消防联动控制系统中的三种作用，重点探讨了它的直接启泵功能。
Three functions of fire hydrant buttons in fire fighting joint control system are discussed and direct pump start is highlighted.
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