Which of the following statements is true concerning centrifugal pumps?（）<br>A:They are particularly suited for pumping high viscosity fluids<br>B:They are started with the discharge valve opened<br>C:The flow of liquid is developed by imparting energy due to the rotation of an impeller<br>D:They are always mounted in a horizontal position

Which of the following statements is true concerning centrifugal pumps?（）
A:They are particularly suited for pumping high viscosity fluids
B:They are started with the discharge valve opened
C:The flow of liquid is developed by imparting energy due to the rotation of an impeller
D:They are always mounted in a horizontal position

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