Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.<br>A:a high suction head<br>B:rotating rings<br>C:badly worn bearings<br>D:a loose stuffing box gland

Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
A:a high suction head
B:rotating rings
C:badly worn bearings
D:a loose stuffing box gland

出自：海船船员证

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