Which of the listed devices would be installed at a control system air pressure reducing station?（）<br>A:Moisture separator<br>B:Vacuum breaker<br>C:Lubricator<br>D:Non-return valve

Which of the listed devices would be installed at a control system air pressure reducing station?（）
A:Moisture separator
B:Vacuum breaker
C:Lubricator
D:Non-return valve

出自：海船船员证

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