In order to properly remove air from the casing of a centrifugal pump when starting, the pump should have a （）.
- Apositive head
- Bnegative suction head
- Cmechanical seal
- Dvent valve attached to the casing at the top of the volute
问题
In order to properly remove air from t
参考解析：
分类：船舶辅助机械题库
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