23 先天性心臟病造成肺動脈高壓的可能機轉為何？① right-to-left shunt ② left-to-right shunt ③ unilateral absence of pulmonary artery ④ increased pulmonary venous pressure
(A)①②③④
(B)②③④
(C)①②④
(D)③④ 

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統計： A(3), B(2), C(1), D(2), E(0) #1117232