Usually we take the cooling effect of the air flown through the cylinder during the overlap period as（）<br>A:inevitable<br>B:harmful<br>C:helpful<br>D:unacceptable

Usually we take the cooling effect of the air flown through the cylinder during the overlap period as（）
A:inevitable
B:harmful
C:helpful
D:unacceptable

出自：海船船员证

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