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问题 单项选择题

钢筋在拉力增加时，变形也增加；当卸去拉力，试件能恢复原状。材料在卸去外力后能恢复原状的性质，这一阶段叫做（）。

A．弹性阶段

B．屈服阶段

C．强化阶段

D．颈缩阶段

答案

参考答案：A

改错题

With the popularity of the Internet, more and more people prefer to going shopping online because its advantages. Online shopping can cost us a lot of valuable time. What’s more , there are a wide variety of goods for us to choose from , which may be cheaper than that in shops. Though it is convenience to go shopping online, the problems it caused can’t be ignored. Since we can’t see the actual goods on the Internet, the quality cannot be ensured. Beside, lots of advertisement on the Internet are untrustworthy, so sometimes the customers are easily cheated.

In my opinion, we should be carefully while we are enjoyed the convenience of online shopping.
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多项选择题

销毁病案之前应做的工作有：（）

A.病案库房的数量

B.病案的年扩展率

C.病案的质量

D.保存病案的年限

E.病案库的储存空间，可容纳病案的数量
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