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问题 单项选择题

钢材在建筑工程中被广泛使用，是因为其具有良好的技术性质，能承受( )。

A．较大的弹性变形，加工性能好

B．较大的塑性变形，加工性能好

C．较大的弹塑性变形，加工性能好

D．较大的弹性变形，较小的塑性变形，力1]32性能好

答案

参考答案：C

阅读理解

We live in the computer age. People use computers to do much of their work. But few people know how to look after them. Remember the following when you use your computer:

① Keep your computer in a cool ,dry room. Too much or too little heat is bad for computers. Damp (潮湿) is also bad for them.

② Do not let people smoke near your computer. Smoke of all kinds is very bad for many parts of a computer.

③ Do not eat or drink when you are near your computer. Pieces of food and a little water in the keyboard are also bad for a computer.

小题1:Computers can ____ people to do a lot of work.

A. help      B. make        C. use

小题2:Few people know how to_____ their computers.

A. look for   B. take care of   C. look at

小题3:A computer works well at a temperature of _____.

A. 0℃       B. 35℃        C. 20℃

小题4:Is smoking good or bad for many parts of a computer?

A. good      B. bad         C. I don’t know.

小题5:A dirty screen or a very bright screen is ______ for your eyes.

A. helpful     B. good        C. bad
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单项选择题

维生素E

A．具碱性、水溶性
B．具酸性、水溶性、旋光性
C．具还原性、脂溶性
D．水解后具还原性、脂溶性
E．具醌式结构、脂溶性
下列药物的理化性质分别是
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