脑梗死脑细胞水肿期，病变区CT表现为() ["A．等密度，边界清楚","B．低密度","C．高密度","D．稍低密度，边界模糊","E．等密度"]
基底节腔隙性脑梗死由下列哪一动脉阻塞引起() ["A．大脑前动脉","B．大脑后动脉","C．基底动脉","D．椎动脉","E．豆纹动脉"]
脑室系统不包括() ["A．中脑导水管","B．侧脑室","C．四脑室","D．三脑室","E．枕大池"]
正常头颅CT轴位鞍上池呈() ["A．圆形或椭圆形","B．梯形或双梯形","C．三角形或梭形","D．长方形或方形","E．五角或六角形"]
脑干结构不包括() ["A．桥脑","B．延髓","C．中脑","D．四叠体","E．颈髓"]
新生儿期是指自__________________至________的时期。
