除氧器再沸腾的作用？

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误。每句中最多有两处，每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（﹨）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1．每处错误及修改均仅限一词；

2．只允许修改10处，多者（从第11处起）不计分.

I went to a shop to buy a jacket one Sunday. It is famous one where there are a variety of clothes. I looked all around and finally find an attractive jacket. When I was asked the price, the assistant said, "Seventy dollars." He added that if I paid by cash, he would give me a discount – ten percent off the fixing price. I thought it was so expensive and started to leave. As I was left, he grabbed me and said, "Okay. Forty-five dollars." Delighting, I bought the jacket. However, when I got home and tried on my new jacket, I realized that anything was wrong with it. It had a pocket where wouldn't open. I was speechless and looked at it in amazement.

邻面龋常开始于()

A．接触点

B．接触点侧

C．牙龈游离龈下

D．接触点龈侧

E．牙颈部

现拟对某采矿权价值进行评估，已知某可参照的采矿权成交价格为3000万元，规模调整系数为1.10，品位调整系数为1.05，价格调整系数为1.15，差异调整系数为0.95，技术性贬值系数为0.13，折现率为9%，则该采矿权评估价值最接近于( )万元。

A．492

B．3450

C．3786

D．5486

系指在水中或规定的释放介质中以零级或接近零级速率释放药物的片剂（）.

A．可溶片 

B．泡腾片 

C．缓释片 

D．控释片 

E． * * 片

普通碳素钢的含硫量不大于（）％，含磷量不大于（）％

A.0.055，0.045

B.0.045，0.04

C.0.05，0.06

D.0.045，0，05