单选题Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）AThe expansion tank should be topped offBThe thermostatic water regulating valves should be manually openedCThe fuel filters should be changedDThe engine should be turned over slowly with the indicator cocks open
单选题
Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）
A
The expansion tank should be topped off
B
The thermostatic water regulating valves should be manually opened
C
The fuel filters should be changed
D
The engine should be turned over slowly with the indicator cocks open
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