69.下列何種因子不存在於陰莖海綿體的平滑肌,促使其鬆弛充血引起勃起?
(A)cyclic guanosine monophosphate (cGMP)
(B)protein kinase G
(C)dopamine
(D)nitric oxide
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統計: A(4), B(9), C(149), D(4), E(0) #3468417
統計: A(4), B(9), C(149), D(4), E(0) #3468417