Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.<br>A:operated manually once an hour<br>B:operated until the engine has started<br>C:placed into operation only at maximum load<br>D:adjustable to meet lubrication requirements

Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.
A:operated manually once an hour
B:operated until the engine has started
C:placed into operation only at maximum load
D:adjustable to meet lubrication requirements

出自：海船船员证

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