In order to properly remove air from the casing of a centrifugal pump when starting, the pump should have a （）.<br>A:positive head<br>B:negative suction head<br>C:mechanical seal<br>D:vent valve attached to the casing at the top of the volute

In order to properly remove air from the casing of a centrifugal pump when starting, the pump should have a （）.
A:positive head
B:negative suction head
C:mechanical seal
D:vent valve attached to the casing at the top of the volute

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