Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by （）.<br>A:a compressed packing gland<br>B:lantern tings between the packing rings<br>C:a liquid seal<br>D:the stuffing box gland

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

出自：海船船员证

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