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问题 单项选择题 A1/A2型题

下列对右旋糖酐输液描述错误是（）

A.它是血浆代用品，但不能代替全血

B.可以提高血浆渗透压，增加血浆容量，维持血压

C.用于治疗血容性休克，如外伤性出血性休克

D.低分子右旋糖酐有扩容作用，但作用时间短

E.本品能改变红细胞电荷，造成血管内红细胞凝聚，所以要慎用

答案

参考答案：E

解析：右旋糖酐输液（血浆代用品）中分子右旋糖酐与血浆具有相同的胶体特性，可以提高血浆渗透压，增加血浆容量，维持血压。用于治疗血容性休克，如外伤性出血性休克。低分子右旋糖酐有扩容作用，但作用时间短。本品还能改变红细胞电荷，可避免血管内红细胞凝聚，减少血栓形成，增加毛细血管的流量，改善微循环。所以答案为E。

问答题

The economic system of the United States is principally one of private ownership. In this system, consumers, producers and government make economic decisions on a daily basis, mainly through the price system. The dynamic interaction of these three groups makes the economic function. The market’s primary force, however, is the interaction of producers and consumers; hence the “market economy” designation.　　As a rule, consumers look for the best values for what they spend while producers seek the best price and profit for what they have to sell. Government, at the federal, state, and local level, seeks to promote public security, assure reasonable competition, and provide a range of services believed to be better performed by public rather than private enterprises.　　Generally, there are three kinds of enterprises: single-owner operated businesses, partnerships and corporations. The first two are important, but it is the latter structure that best permits the amassing of large sums of money by combining the investments of many people who, as stockholders, can buy and sell their shares of the business at any time on the open market. Corporations make large-scale enterprises possible.The economic system of the United States is principally one of private ownership. In this system, consumers, producers and government make economic decisions on a daily basis, mainly through the price system. The dynamic interaction of these three groups makes the economic function. The market’s primary force, however, is the interaction of producers and consumers; hence the “market economy” designation.
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单项选择题 A1/A2型题

断冠状动脉硬化性心脏病最常用的非创伤性检查方法是（）

A.超声心动图

B.心电图运动负荷试验

C.24小时动态心电图

D.休息时心电图

E.心脏CT检查
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