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下列位置何者發生顱內先天性動脈瘤(arterial aneurysm)的機率最高?(A)威利氏環(circle of Willis)前交通動脈(anterior communica- ting artery)處 (B)內頸動脈(internal carotid artery)進入威利氏環(circle of Willis)處 (C)威利氏環(circle of Willis)後交通動脈(posterior communicating artery)處 (D)基底動脈(basilar artery)進入威利氏環(circle of Willis)處
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