题目内容
一侧颈内动脉闭塞，可无临床 症状，是因为
2021-10-20
A.同侧颈外动脉未闭塞
B.对侧颈内动脉未闭塞
C.正常脑底动脉环可迅速建 立侧支循环
D.双侧椎动脉未闭塞
E.颅内血管变异
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