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单选题
Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump?（） (1) Its discharge is continuous (2) It has no internal valves (3) Upon accidental closing of discharge valve, excessive pressure will not build up
A
（1），（2）
B
（2），（3）
C
（1），（2），（3）
D
（2）only
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