Air tightness test and safety valve adjusting for main air receiver (control air receiver, air horn receiver) on board.

主空气瓶(制空气瓶、笛空气瓶)船后气密试验和安全阀的调整。

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Air tightness test and safety valve adjusting for main air receiver (control air receiver, air horn receiver) on board.

主空气瓶(制空气瓶、笛空气瓶)船后气密试验和安全阀的调整。

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