The primary duty of lube oil is to reduce （） between the working parts of an engine.<br>A:power output<br>B:friction and wear<br>C:indicated pressure<br>D:rated horsepower

The primary duty of lube oil is to reduce （） between the working parts of an engine.
A:power output
B:friction and wear
C:indicated pressure
D:rated horsepower

出自：海船船员证

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