题目: 冠心病的左主干病变是指病变位于()A.发出前降支与回旋支的共同开口B.发出钝缘支与前降支的共同开口C.发出对角支与回旋支的共同开口D.发出后降支与前降支的共同开口E.发出前降支与对角支的共同开口 答案: 参考答案:A
题型:选择题 The boy seated himself in the corner with his back to his father.A.turningB.to turnC.to be turnedD.turned 查看答案