Why is it necessary to extend ventilators of gasoline powered vessels to the bilges（）.<br>A:To keep them dry，and thus easier to clean<br>B:To remove fuel vapors which are heavier than air<br>C:To provide adequate air to the engines<br>D:To cool the machinery areas

Why is it necessary to extend ventilators of gasoline powered vessels to the bilges（）.
A:To keep them dry，and thus easier to clean
B:To remove fuel vapors which are heavier than air
C:To provide adequate air to the engines
D:To cool the machinery areas

出自：海船船员证

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