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

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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