To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the （）.<br>A:shaft and impeller<br>B:motor and pump shaft<br>C:casing and impeller wearing rings<br>D:lantern ring and impeller

To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the （）.
A:shaft and impeller
B:motor and pump shaft
C:casing and impeller wearing rings
D:lantern ring and impeller

出自：海船船员证

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