单选题Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?（）AOil is discharged from the impeller through the outletBGravity causes the oil to flow toward the dischargeCThe self-priming feature of the centrifugal pump enables it to draw its own suction as it startsDThe discharge capacity varies directly with the speed of the impeller
单选题
Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?（）
A
Oil is discharged from the impeller through the outlet
B
Gravity causes the oil to flow toward the discharge
C
The self-priming feature of the centrifugal pump enables it to draw its own suction as it starts
D
The discharge capacity varies directly with the speed of the impeller
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