Vents are led from the engine to the head tank for the release of （） from the cooling water.<br>A:air<br>B:heat<br>C:sludge<br>D:steam

Vents are led from the engine to the head tank for the release of （） from the cooling water.
A:air
B:heat
C:sludge
D:steam

出自：海船船员证

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