单选题The oil in a cargo winch gear box should be sampled periodically to （）.Aprevent the gear box from leakingBprevent the oil from becoming inflammableCmake sure it has not become contaminatedDmake sure the motor bearings are lubricated
单选题
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
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