The exhaust pipe must be gas tight throughout its entire length otherwise（）.<br>A:bilge water may enter the exhaust pipe<br>B:entry of air may cause vapor lock<br>C:carbon monoxide may enter the interior of the vessel<br>D:the joint gaskets may be blown

The exhaust pipe must be gas tight throughout its entire length otherwise（）.
A:bilge water may enter the exhaust pipe
B:entry of air may cause vapor lock
C:carbon monoxide may enter the interior of the vessel
D:the joint gaskets may be blown

出自：海船船员证

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