If the discharge valve is closed before the drive motor is stopped, which of the following types of pumps will most likely be damaged?（）<br>A:Centrifugal<br>B:Gear<br>C:Propeller<br>D:Turbine

If the discharge valve is closed before the drive motor is stopped, which of the following types of pumps will most likely be damaged?（）
A:Centrifugal
B:Gear
C:Propeller
D:Turbine

出自：海船船员证

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