9 下列那一構造物存在於後室間溝(posterior interventricular groove)?
(A)後降支(posterior descending a.)
(B)右冠狀動脈(right coronary a.)
(C)左冠狀動脈(left coronary a.)
(D)肋頸幹(costocervical trunk)

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統計: A(19), B(4), C(3), D(0), E(0) #865442

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