What is a characteristic of all centrifugal cargo pumps? （）<br>A:They are self-priming<br>B:Decreasing the speed of rotation will decrease the discharge pressure<br>C:Opening the discharge valve wider will increase the discharge pressure<br>D:All of the above

What is a characteristic of all centrifugal cargo pumps? （）
A:They are self-priming
B:Decreasing the speed of rotation will decrease the discharge pressure
C:Opening the discharge valve wider will increase the discharge pressure
D:All of the above

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