题目

Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed? (1) gear; (2) centrifugal; (3) screw.A. (1) and (2)B. (1), (2) and (3)C. (1) and (3)D. (2) and (3)

Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed? (1) gear; (2) centrifugal; (3) screw.

A. (1) and (2)

B. (1), (2) and (3)

C. (1) and (3)

D. (2) and (3)

题目解答

答案

C. (1) and (3)