喜马拉雅山南坡降水量远远多于北坡，其主要影响因素是[ ] A、纬度位置 B、人类

既能清肝热，又能散郁结的药物是( )

A．决明子

B．夏枯草

C．龙胆草

D．野菊花

E．青黛

People wear hats for three main reasons: protection, communication, and decoration.

Protection. People first began to wear hats to ___1___ themselves from the climate. In hot, sunny climates, wide-edged hats provide ___2___ from the sun. In cold climates, people often wear wool hats. In some regions, people wear a variety of protective hats, ___3___ the season. They may wear a wool hat in winter, a rain hat in spring or fall, and a wide-edged hat in summer. Hats also provide protection in certain ___4___. Construction workers, football players, military personnel, and people in many other fields wear metal or plastic helmets(头盔)for protection from ___5___.

Communication. Hats can communicate various things about the people who wear them. The hats of coal miners, cowboys and firemen indicate the wearer's ___6___. Students may wear a mortarboard (学位帽) to show they are graduating from high school or college.

Decoration. Most people wear a hat that they believe makes them look attractive, ___7___ the hat's main purpose may be protection or communication. Many protective hats are attractive and stylish. Even the caps of police officers and military personnel are designed to ___8___ the wearer's appearance. Certain decorative hats are worn as a (n) ___9___. In Scotland, for example, people wear a cap called a tam-o'-shanter that is part of their national costume (服装). Many people change their style of hat from time to time because they feel more ___10___ when keeping up with the latest fashion.

1. A. defend     B. protect    C. prevent   D. hide

2. A. shade    B. shadow      C. security    D. cover

3. A. resulting from  B. basing upon  

C. relating to  D. depending on

4. A. seasons      B. climates     C. activities    D. communities

5. A. injury     B. destruction   C. harm   D. pollution

6. A. experience     B. occupation  C. personality  D. education

7. A. as   B. unless   C. though  D. because

8. A. change    B. increase   C. display   D. improve

9. A. tradition  B. label    C. honour     D. fashion

10. A. sociable    B. informal    C. attractive    D. noble

电缆中一对芯线的直流电阻之和称为环阻。它是两条单根芯线电阻（），不同线径，不同长度，有不同的环阻值。

A.取最大值 

B.取最小值 

C.相加 

D.相减

（）是哺乳动物中种类最多的啮齿动物。

A.苍蝇

B.蚊子

C.蟑螂

D.老鼠

某工业锅炉焊接安装工程承包给某设备安装工程公司。本锅炉安装工程为散装锅炉安装工程，承包商在施工前制定了严格的施工程序，并提出施工技术要点。在施工中，根据《钢结构工程施工质量验收规范》规定，对原材料及成品进行进场检验，并对焊接材料、连接件、紧固件以及焊接工艺进行检验，使其满足规范要求，设备及零件均符合要求后开始施工。

对钢材板厚等于或大于（），且设计有Z向性能要求的厚板，应进行复检。

A．20 mm

B．30 mm

C．40 mm

D．50 mm