57 下列那項裝置屬於呼吸器上的氣流控制閥（flow-control valve）？① proportional solenoid valve ② mushroom balloon valve ③ stepper motor with valve ④ scissors valve
(A) ①②③
(B)①②④
(C)①③④
(D)②③④

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統計： A(0), B(2), C(12), D(0), E(0) #1103628