12. digitalis 用於 atrial arrhythmias 乃因其具有下列何種作用？
(A)inhibit Na+/K+ ATPase
(B)inhibit phosphodiesterase
(C)atropine-like effect
(D)increase sympathetic activity

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統計： A(7), B(0), C(1), D(2), E(0) #865245