阿摩線上測驗
23. The volume displaced per cycle of a reciprocating pump remains constant, which is the function of diameter of piston and ____.
(A)stroke
(B)rotational speed
(C)power of motor
(D)fluid density
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統計： A(10), B(3), C(1), D(2), E(0) #4054426
統計： A(10), B(3), C(1), D(2), E(0) #4054426
