Before pumping up the crankcase oil,（） should be worked by hand to minimize corrosive action on the liners.<br>A:the indicators<br>B:the starting valves<br>C:the cylinder lubricators<br>D:the turning gear

Before pumping up the crankcase oil,（） should be worked by hand to minimize corrosive action on the liners.
A:the indicators
B:the starting valves
C:the cylinder lubricators
D:the turning gear

出自：海船船员证

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