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If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of following precautions should be observed?（）
A:The cylinder indicator cocks should be opened
B:The sump lube oil scavenge pump should be secured immediately
C:The explosion relief valves should be manually opened
D:The crankcase should remain unopened until the engine has cooled

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出自：海船船员证

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