The oil in a cargo winch gear box should be sampled periodically to （）.<br>A:prevent the gear box from leaking<br>B:prevent the oil from becoming inflammable<br>C:make sure it has not become contaminated<br>D:make sure the motor bearings are lubricated

The oil in a cargo winch gear box should be sampled periodically to （）.
A:prevent the gear box from leaking
B:prevent the oil from becoming inflammable
C:make sure it has not become contaminated
D:make sure the motor bearings are lubricated

出自：海船船员证

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