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问题 多项选择题


某天16:10，某厂维修班开始检修连接污油池的输油管线，16:20钳工甲将带有底阀的输油管线放入污油池内，当时污油池内油的液面高度为50cm，上面浮有30cm厚的污油，在连接100cm高的法兰时，由于法兰无法对正而连接不上，班长乙去车间喊电焊工丙，17:10电焊工丙带着电焊机到达现场，由于是油池附近作业，电焊工丙在现场准备好后，去车间办理动火，17:20，钳工甲见丙迟迟没有回来，快到下班时间，于是用电焊开始焊接，焊接3分钟左右，发生油气爆炸，爆炸将油池顶盖掀开，油池着火，钳工甲在油池附近死亡。
根据以上场景，回答下列问题

该事故中引起油气爆炸有关的因素有( )。

A．空气

B．油与挥发的气体

C．环境温度

D．电焊焊接所产生的弧光

E．污油

答案

参考答案：A,B,C,D

解析： 油气爆炸需要具备的条件是具有一定能量的点火源、达到爆炸极限的混合性气体，电焊引起的弧光是点火源，空气、油及油挥发产生的气体构成爆炸性混合气体，而环境温度可以影响油的挥发程度。

单项选择题 A3/A4型题

患者女性，35岁。黄疸、贫血伴关节酸痛3个月，体检：巩膜黄染，脾肋下2cm，血红蛋白58g／L，白细胞5×109／L，血小板120×109／L，网织红细胞25％，外周血涂片成熟红细胞形态正常，尿隐血试验（-）。

下列实验室检查中与本病不符的是（）

A.血清非结合胆红素升高

B.血清结合珠蛋白升高

C.血涂片中出现幼红细胞

D.网织红细胞数升高

E.红细胞寿命缩短
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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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