本质安全指为了保证生产的安全，在机械设备的（）就采取本质安全的技术措施来消除机械危险

信息匹配。下面是5个人使用因特网的目的，以及6条与之相关的信息， 请为为每个人匹配到最佳的

信息。其中有1项是多余的。

A. I like music very much. I often download MP3 music online. I can get the music I want, such as classical,

     pop, and rock music.

B. I play chess with people all round the world. Last night I had a game with someone from Japan. I also

    download games from the Internet.

C. I use it more and more to buy books and CDs, and even I bought some clothes on the Internet. It was very

    easy and good.

D. I use the online dictionaries, encyclopedias (百科全书) and magazines. It's great because I can download

     pictures or articles and use them in my schoolwork. It's easy and it's free.

E. I usually chat with people on the Internet. I make lots of friends. They live in different parts of China, and

    even out of China.

F. I usually write e-mails to my customers (客户) on the Internet. And my customers answer me by e-mail,

    too. It has been a fast way for us to communicate with each other.

( )1. Helen: I find the Internet is very good for shopping.

( )2. Jack: I use the Internet to play games.

( )3. Mary: The Internet helps me with my schoolwork.

( )4. Cindy: I use the Internet to send e-mail.

( )5. Ruby: I use the Internet to make a lot of friends.

高级抹灰的组成包括（）。

A、一底层、一面层

B、一底层、一中层、一面层

C、一底层、几层中层、一面层

D、一底层、一中层、几层面层

收集和记录学生自己、教师或同伴作出评价的有关材料，以及学生的作品、反思和其他相关的证据与材料，以此来评价学生学习和进步的状况，这种评价是（）。

A.发展性学生评价

B.档案袋评价

C.表现性评价

D.学生自我评价

抗菌后效应（postantibioticeffect）

稳定轻质混合土，运输过程中车速小于（），并用盖布铺盖。

A.20km/h

B.30km/h

C.40km/h

D.50km/h