产科病人硬膜外阻滞用于分娩镇痛时,局麻药首选()。
A.1%利多卡因
B.0.25%布比卡因
C.2%利多卡因
D.1%丁卡因
E.0.0625%~0.1%罗哌卡因
参考答案:E
Without plenty of oral practice, you'll find it hard to ______ a conversation with native English speakers. [ ]
A. go on
B. carry on
C. carry out
D. work on
安全灯的颜色是()
A.绿色
B.红色
C.蓝色
D.以上都不对