单项选择题
A.insufficient speed
B.cavitation
C.excess discharge pressure
D.excessive net positive suction head B
单项选择题 The valve which is most suited for regulating the flow through a pipeline is a （）
单项选择题 Increasing the speed of a centrifugal pump will result in an increase in its capacity in its capacityAnother means of increasing the capacity pump is to increase the（）
单项选择题 Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?（）