Shaft sealing in a centrifugal pump can be effected by （）.<br>A:the mechanical seal<br>B:packed stuffing boxes<br>C:either A or B<br>D:neither A nor B

Shaft sealing in a centrifugal pump can be effected by （）.
A:the mechanical seal
B:packed stuffing boxes
C:either A or B
D:neither A nor B

出自：海船船员证

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