第25题: [单项选择]如果颈内动脉阻塞或高度狭窄,同侧颈总动脉将出现哪种变化() A. 阻力指数降低 B. 阻力指数升高 C. 收缩期峰值流速升高 D. 舒张期峰值流速升高 E. 血流反向 参考答案:B 答案解析:如果颈内动脉阻塞或高度狭窄,同侧颈总动脉血流阻力指数将升高,收缩期与舒张期峰值流速将降低。
第32题: [单项选择]In which scenario would index be most useful?() A. The indexed column is declared as NOT NULL. B. The indexed columns are used in the FROM clause. C. The indexed columns are part of an expression. D. The indexed column contains a wide range of values. 参考答案:D