患者男性，28岁，突发胸痛，呼吸困难，X线诊断为气胸，其体征与胸腔积液的区别关键是A

利用下列实验装置完成相应的实验，能达到实验目的是（　　）

A．检验溶液中是否含有NaCl

B．除去乙醇中溶有的少量乙酸

C．实验室中制取少量蒸馏水

D．用MnO₂和浓盐酸制备Cl₂

Advertising can be a service to the customer. This is true when advertisements give reliable infor­mation about the goods advertised. Such information is needed if the customer is to make a sensible choice when he buys. It is useful in that it lets him know of the kinds of goods in the shops. Printed advertisements do this job best. Customers can collect them and compare them. They can be taken along to shops and their claims can be checked against the actual goods in the shops.

however, some advertisements are not very useful to the customer. Instead of helping him to sat­isfy his real needs, they set out to make him want things. They set out to create a need. These adver­tisements are cleverly done. The people who produce them understand our weaknesses. They set out to make us believe that what they advertise will make us cleverer, prettier and more handsome, if only we use it. Actually, it is our money they are after and we should be on guard.

Some advertisements mislead customers by using part of the truth to suggest something false, and it is skillfully made to give that idea to the careless reader, listener or viewer.

At its best advertising can be useful to the customer. At its worst it can mislead him. Many newspapers check on the goods for which the advertisements made claims. Most newspapers are very careful about the small advertisements, which try to sell goods directly to the readers by post. Many newspapers print information about this on their small advertisement pages. Advertising has become a very big business, and good firms in it do all they can to make sure it is conducted with some attention to truth. This is a help to the customer. But the best way is for customers to be on the lookout.

小题1:It can be inferred from the passage that advertisements can be useful if they ________.

A．how a long list of the goods advertised

B．give true information about goods

C．tell customers what to buy

D．appear on TV and in newspapers at the same time小题2:Advertisements that play on our weaknesses make us ________.

A．desire things we do not need

B．purchase the goods we need

C．attracted by them

D．become loyal reader, listener or viewer小题3: according to the text, which of the following is TRUE?

A．All advertising firms do not care to tell the truth about the goods they advertise.

B．All advertising firms only care to make money, as advertising is a big business.

C．Most advertising firms make sure that advertisements do not purposely cheat.

D．The advertised goods are often of poor quality.小题4:The underlined word "They" refers to ________.

A．Goods

B．Customers

C．Shops

D．Advertisements

金属基复合材料界面的结合形式有哪几种？

某电气装置安装工程项目。该工程项目包括：室外线路安装、室内线路安装、室内电缆安装以及硬母线安装等。该工程项目由某电力建筑安装工程公司承担施工任务。在施工过程中，当进行室外电缆敷设时，发现埋设的电缆深度不够，且有些部位应该有固定点埋件但没有。在试通电时，由于其中一根绝缘导线未绝缘，造成一名施工人员触电后死亡，随即展开了事故调查。

电气线路安装时，螺栓固定式横担应在建筑外墙装饰工程（）安装。

A．结束时

B．结束前

C．开始前

D．开始后

毒蛇咬伤后易致失血性休克的最常见毒蛇是（）

A.金环蛇

B.蝮蛇

C.五步蛇

D.眼镜蛇

E.海蛇