If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.<br>A:packing gland<br>B:mechanical seals<br>C:lantern rings<br>D:wearing rings

If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.
A:packing gland
B:mechanical seals
C:lantern rings
D:wearing rings

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