单选题Which of the following statements about pump operations is NOT a correct statement?（）AIn order for a fluid to be pumped, a fluid must be made to flowBA substance must be cold in order for it to be pumpedCThe kinetic energy imparted by the pump can be used to force a liquid through a hydraulic systemDA pump must receive its energy from an external source
单选题
Which of the following statements about pump operations is NOT a correct statement?（）
A
In order for a fluid to be pumped, a fluid must be made to flow
B
A substance must be cold in order for it to be pumped
C
The kinetic energy imparted by the pump can be used to force a liquid through a hydraulic system
D
A pump must receive its energy from an external source
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