Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.<br>A:the power stroke<br>B:the compression stroke<br>C:low load operation only<br>D:periods of standby

Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.
A:the power stroke
B:the compression stroke
C:low load operation only
D:periods of standby

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