阿摩線上測驗
5. What kind of pumps is applying the action of piston to force the liquid?
(A) Screw pumps
(B) Gear pumps
(C) Reciprocating pump
(D) Centrifugal pumps
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統計： A(38), B(101), C(658), D(130), E(0) #3147370
統計： A(38), B(101), C(658), D(130), E(0) #3147370
