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问题 单项选择题

休克的实质是

A．血压下降
B．中心静脉压(CVP)下降
C．脉压下降
D．心排出量下降
E．组织灌注不足并细胞缺氧

答案

参考答案：E

解析：[考点] 外科休克的病理生理
[分析] 休克的实质是各种原因引起的有效循环血容量减少，组织灌注不足，细胞代谢紊乱和功能受损的综合征。血压下降、 CVP下降、脉压下降、心排出量下降都只是休克的临床表现。

单项选择题

缺铁性贫血患者铁的变化顺序是

A．低血清铁-骨髓贮存铁减少-贫血
B．低血清铁-贫血-骨髓贮存铁减少
C．骨髓贮存铁减少-贫血-低血清铁
D．骨髓贮存铁减少-低血清铁-贫血
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单项选择题

Congress makes the laws in the United States. It has two parts, which are more or less equal in power. They are known as the House of Representatives and the Senate. The House of Representatives is larger than the Senate whose 100 members (two from each state) serve for six years. The 435 members of the House are elected every two years, and the number from each state is determined by the population of the state. For example, California, which has a large population, has 43 representatives, while the State of Nevada has only one.
The House and Senate are divided into small groups which take care of special matters such as education or foreign affairs. The most important work of Congress is often done in these groups, which are called subcommittees.

In the U.S. Congress, the House of Representatives and the Senate are______.
A. not equal. The House is more powerful
B. almost equal in power
C. not equal. The Senate is far more powerful
D. different. The House is more important

According to the Constitution of the United States, a senator must be at least 30 years old and he must have been a citizen of the United States for nine years at the time of his election. To be elected to the House a person must be 25 years old and must have been a United States citizen for seven years. At the present time, members of Congress include businessmen, farmers, teachers, and especially lawyers. In general, senators are better known than representatives because they are fewer in number and serve for a longer time. Many American presidents served in Congress before they became president.
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