21.下列何者是陰莖勃起功能(penile erection)最重要的血管?
(A)陰莖背動脈(dorsal artery of penis)
(B)陰莖深動脈(deep artery of penis)
(C)陰莖淺背靜脈(superficial dorsal vein of penis)
(D)陰莖球動脈(artery of the bulb of penis)

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統計: A(50), B(178), C(10), D(13), E(0) #1028733

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