血浆晶体渗透压

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     A taboo is a social action that is not allowed. Every culture in the world has its own taboos. The breaking

of a taboo sometimes makes people feel uncomfortable. I learned this through my own experience.

     Last weekend, Wang Lin and I showed two foreigners around our city. Mr. Singh was from India and

Mr. White from the USA. When I held out my left hand to shake hands with him, Mr. Singh seemed to be

unhappy. Mr. White, however, was quite casual (随意的). He said hello to me with a big smile and a wave

of his hand.

     In the evening, we stopped at a restaurant for dinner. I noticed that Mr. Singh didn't touch the beef and

Mr. White seemed not to like chickens' claws(爪子). During the meal, Wang Lin said sorry to Mr. Singh and

continued to explain that we didn't know it was a taboo in India to shake one's left hand. Mr. Singh explained

that since oxen (牛) are sacred (神圣的) in India, people don't eat beef there. Mr. White joined in and said that

it was not usual in the States for people to eat chickens' claws. He went on to say that Americans don't usually

get into each other's personal space. Isn't it a good lesson to remember?

抑制排卵的方法（）。

A.药物抑制

B.使用避孕套

C.安全期抑制

D.放置节育器

E.使用 * * 隔膜

先用特殊方法把固体物质加工成纳米级（1nm～100nm，1nm=10^-9m）的超细粉末粒子，然后再制成纳米材料是制造纳米材料的一种工艺．下列分散系中的分散质的微粒直径比纳米材料中超细粉末粒子还要小的是（　　）

A．悬浊液

B．乳浊液

C．溶液

D．胶体

简述大卫的《马拉之死》。

正常机体中的无菌部位是

A．皮肤表面

B．黏膜表面

C．外耳道

D．血液

E．眼结膜