单选题Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.Aa high suction headBrotating ringsCbadly worn bearingsDa loose stuffing box gland
单选题
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
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