单选题Which of the listed pre-start procedures should be carried out prior to starting a crosshead type diesel engine after an overhaul?（）APre-lube cylinders with hand cranksBOpen all air space drain cocksCOpen all indicator valvesDAll of the above
单选题
Which of the listed pre-start procedures should be carried out prior to starting a crosshead type diesel engine after an overhaul?（）
A
Pre-lube cylinders with hand cranks
B
Open all air space drain cocks
C
Open all indicator valves
D
All of the above
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