阿摩線上測驗
8. What following set of pumps is positive displacement type?
(A) Rotary pump and Reciprocating pump
(B) Centrifugal pump and Injection pump
(C) Centrifugal pump and Rotary pump
(D) Volute pump and Injection pump
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統計： A(635), B(107), C(187), D(65), E(0) #3126409
統計： A(635), B(107), C(187), D(65), E(0) #3126409
