单选题Before a marine diesel engine is started the cylinders and pistons must be （）.Acooled to appropriate temperatureBwarmed up gradually to appropriate temperatureCopened up and renewedDground and polished
单选题
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
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