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In order to properly remove air from the casing of a centrifugal pump when starting, the pump should have a （）.

单选题
2022-11-22 13:15
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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正确答案
D
试题解析
标签： 船舶辅助机械
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