问题 单项选择题

高渗氯化钠(7.5%NaCl)用于失血性休克的救治,下列不正确的是()

A.凡有大出血者,立即应用

B.用量为4~6ml/kg,升压效果好,心率减慢,尿量增加

C.输入250ml的效果相当于输注等渗液2000ml的复苏效果

D.作用机制为提高血浆渗透压,把组织间隙及肿胀细胞内水吸出扩充血容量

E.与分子量7万的右旋糖酐配伍使用,效果较单用好,而持续时间更长

答案

参考答案:A

解析:高渗氯化钠有加重出血的可能性,故应在出血控制后应用。另外,高渗氯化钠与分子量7万的右旋糖酐伍用,即配成7.5%NaCl/6%右旋糖酐70的抗休克效果,以及对维持机体平均动脉压(MAP)、心排血量、血浆容量、氧耗量、脏器血流量及存活率均较好,其用量仅为乳酸林格液的1/10。但存在的缺点是右旋糖酐有发生过敏反应的可能,并干扰配血。因此,必须在输注前即抽取血标本配血。

阅读理解

阅读理解。

     Gold Coast family holidays are always great fun whether you are from Australia or from abroad. There

are beautiful beaches, adventure parks, nature parks and so much more.

     There are so many sights to see here. It is a pity to drive in a car and you'll miss a great part of it.

Australia is home to many animals and birds that can only be seen when moving slowly and going into the

areas that they live.

     When you are on a bicycle, you have the advantage of being able to stop whenever you want to see an

interesting animal or bird that you have never seen before. It is a quieter mode (方式) of transportation as

well, so you might even be able to take a picture. When you are on the beach, you can breathe that clean air

and view the beauty of the water and sand. It is a totally different experience from either simply sunbathing or

passing it in a car.

     There are many choices of hiring a bicycle to experience the Gold Coast attractions. There are stores that

will fit a bike perfectly to your size. These bikes for both adults and children are in many styles and colors to

please any taste. If you have ever wanted to try a tandem bike (双人单车), now is your chance, because they

have those too.

     A bicycle hire on Gold Coast is something that everyone should try at least once. This is a wonderful

chance for anyone who likes to cycle and it is also a cheap way to travel with your family.

1. You'd better not drive in a car on Gold Coast because ______.

A. you will break the traffic rules

B. you will cause much noise

C. you can't enjoy the beautiful sights well

D. you can't drive into some parks

2. The following advantages of hiring bikes are mentioned EXCEPT that ______.

A. you can take photos of animals

B. it is a cheap way of traveling

C. you can get a clearer sight of animals

D. it is a good way to do sunbathing

3. What is paragraph 4 mainly about?

A. How to hire bikes on Gold Coast.

B. What kinds of bikes there are in stores.

C. What bikes are the most popular.

D. Who can hire bikes on Gold Coast.

4. What's the author's attitude towards a bike hire on Gold Coast?

A. He supports it very much.

B. He thinks it's a personal choice.

C. He doesn't like this way of traveling.

D. He thinks it's only good for adults.

问答题