对于交流电动列车来说就是牵引变流器一般为逆变器。

阅读理解。

     American schools' beginning is in September after a long summer holiday. There are two terms in a school

year. The first term is from September to January, and the second is from February to June. Most American

children begin to go to school when they are five years old. Most students are seventeen or eighteen years old

when they finish high school.

     High school students take only four or five subjects each term. They usually go to the same classes every

day, and they have homework for every class. After class they do many interesting things.

     After high school, many students go to college. They can go to a small one or a large one. They usually

have to give a lot of money. So many college students work after class to get the money for their studies.

1. How many terms are there in a school year in America?

A. Four

B. One

C. Three

D. Two

2. When does a summer holiday end (结束) in America?

A. In January

B. In September

C. In July

D. In June

3. When a child is ________ years old, he or she can go to school.

A. five

B. four

C. seven

D. six

4. How many subjects do the high school students take each term?

A. As many as they like.

B. Five.

C. Four.

D. Four or five.

5. Why do many college students have to work after class?

A. Because some work is helpful to their studies.

B. Because the teachers ask them to do so.

C. Because they like to work very much.

D. Because they need to get money for their studies.

依次填入句中横线处的词语，最恰当的一组是  [ ]

①现代的人可以用现代字音来读古代的书，这就_________了语音变化的真相。

②葬礼没了众多与此无关的热闹，老人的身后却多了一份_________，老人本来就是寂寞的。

③不同的人，对“人是什么”这个问题的回答是_________不同的。

A．掩盖  清静  截然

B．掩饰  清静  截然

C．掩饰  清净 迥然

D．掩盖  清净  迥然

( )是治安案件查处程序中最为重要的一个环节。

A．治安案件的调查

B．治安案件的侦察

C．治安案件处罚的决定

D．治安案件处罚决定的执行程序

目前不适用一个季度为纳税申报期的企业有（）

A.主管税务机关核定的小规模纳税人

B.营改增后实行合并纳税的航空运输企业的总机构

C.实行汇总纳税的连锁超市

D.营改增后实行合并纳税的铁路运输业的总机构

幻觉的定义为（）

A.人脑接受各种客观刺激所产生的知觉

B.人脑在没有客观刺激的情况下所产生的知觉体验

C.客观刺激作用于各感觉器官后所产生的知觉

D.人脑对各种客观刺激分析综合后所得出的知觉体验

E.人脑对客观事物的歪曲和错误的知觉