Following an overhaul of a crosshead type diesel engine the engine is jacked over with th
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Following an overhaul of a crosshead type diesel engine, the engine is jacked over with the turning gear as part of the pre-start procedure, which of the listed pre-start procedures should be carried out？
A.Ensure proper cylinder lube oil flow
B.Open all air space drain cocks
C.Open all indicator valves
D.all of the above
请帮忙给出正确答案和分析，谢谢！