When sailing in cold zones, the（） should be drained of water.<br>A:the ventilation pipe<br>B:the water line for fire fighting on the deck<br>C:the fuel oil line<br>D:the water supplying line in bath room

When sailing in cold zones, the（） should be drained of water.
A:the ventilation pipe
B:the water line for fire fighting on the deck
C:the fuel oil line
D:the water supplying line in bath room

出自：海船船员证

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