The packing installed in the pump stuffing box is lubricated by （）.<br>A:gravity and feed oil cups<br>B:grease cups<br>C:hand during installation<br>D:leakage through the stuffing box

The packing installed in the pump stuffing box is lubricated by （）.
A:gravity and feed oil cups
B:grease cups
C:hand during installation
D:leakage through the stuffing box

出自：海船船员证

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