Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented

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Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by _____.

A.a compressed packing gland

B.lantern tings between the packing rings

C.a liquid seal

D.the stuffing box gland

请帮忙给出正确答案和分析,谢谢!

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