Prior to running the hydraulic pump, examine the system carefully and ensure that the lever of control valves is in （） position.<br>A:neutral<br>B:end<br>C:opening<br>D:closure

Prior to running the hydraulic pump, examine the system carefully and ensure that the lever of control valves is in （） position.
A:neutral
B:end
C:opening
D:closure

出自：海船船员证

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