Before a marine diesel engine is started the cylinders and pistons must be （）.<br>A:cooled to appropriate temperature<br>B:warmed up gradually to appropriate temperature<br>C:opened up and renewed<br>D:ground and polished

Before a marine diesel engine is started the cylinders and pistons must be （）.
A:cooled to appropriate temperature
B:warmed up gradually to appropriate temperature
C:opened up and renewed
D:ground and polished

出自：海船船员证

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