单选题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) screwA（1）and（2）B（1），（2）and（3）C（1）and（3）D（2）and（3）
单选题
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）
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