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

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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