在一个已经打开的表中，使用命令 ______ 可确保记录指针定位在记录号为1的记录上

根据句意及首字母提示，写出空白处所缺的单词。

1. When the t_______ lights are red, you must stop and wait.

2. Did you r_______ her letter the day before yesterday?

3. We must keep our classroom c_______ every day.

4. Look! It's raining outside. You'd better put on your raincoat or take an u_______.

5. N_______ Li Lei nor Liu Mei is in the classroom now.

You have no idea how she finished the relay race________her foot wounded so much.                   [ ]

A. for            

B. when      

C. with          

D. while

条件反射

走向生态文明新时代，建设（）中国，是实现中 * * 伟大复兴的中国梦的重要内容。

下面属于直流电机出厂试验项目的是（）。

A．长时温升

B．效率

C．超速和换向