生产作业场所加强通风.隔离，可降低有毒有害气体的浓度。

SLE中枢神经系统损害可表现为（）

A.精神障碍

B.脑膜炎

C.脑炎

D.癫痫样抽搐

当消防用电负荷为一级时，应设置自动启动装置，并在主电源断电后（）内供电。

A.20s

B.25s

C.30s

D.35s

句型转换，每空一词。

1. They can hardly do the things they like. (改为反意疑问句)

    They can hardly do the things they like ______ ______?

2. I have been collecting stamps for many years. (对画线部分提问)

    ______ ______ you been collecting stamps?

3. We saw him go into a shop yesterday afternoon. (改为被动语态)

    He was ______ ______ go into a shop yesterday afternoon. (同义句改写)

4. If you don't study hard, you will fall behind others. (同义句改写) 

    ______ you study hard, you ______ catch up with others.

5. She became strong day by day as he took exercise. (同义句改写)

    The ______ exercise she took, the ______ she became.

电源线接在插座上或接在插头上是一样的。