A centrifugal pump may fail to deliver water when first started if the （）.<br>A:water seal pipe is plugged<br>B:pump is not primed<br>C:seal ring is improperly located<br>D:impeller is flooded

A centrifugal pump may fail to deliver water when first started if the （）.
A:water seal pipe is plugged
B:pump is not primed
C:seal ring is improperly located
D:impeller is flooded

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