Proper operation of the main engine reduction gear set requires the operation to monitor （）<br>A:the sump oil level<br>B:oil flow sight glasses<br>C:bearing temperatures<br>D:all of the above

Proper operation of the main engine reduction gear set requires the operation to monitor （）
A:the sump oil level
B:oil flow sight glasses
C:bearing temperatures
D:all of the above

出自：海船船员证

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