机动车驶入双向行驶隧道前,要如何使用灯光
A.开启危险报警闪光灯
B.开启远光灯
C.开启雾灯
D.开启近光灯
参考答案:D
We()on this project for four hours. Let's have a rest.
A. are working
B. have been working
C. worked
D. had worked
尿常规检查需何时留取尿标本()
A.饭前半小时
B.晨起第一次尿
C.连续收集12小时尿
D.连续收集24小时尿
E.随时收集尿液