问题 问答题 论述题

韶山,型电力机车两端转向架和中间转向架在结构上有什么不同?

答案

参考答案:

韶山,型电力机车每台转向架由构架、轮对电机装置、一系弹簧悬挂装置、齿轮传动装置、电机悬挂装置、二系弹簧悬挂装置、基础制动装置、牵引装置等主要部件组成;其中两端转向架还设有蓄能制动装置、轮缘喷油润滑装置、撒砂装置;中间转向架设有滚子装配装置,以实现机车通过曲线时产生较大的横向偏移量。

阅读理解

阅读短文,选择正确答案。

    It's the lunchtime break at Shanghai Xianxia Middle School. No mobile phones can be heard ringing anywhere.

The common sight of crowds of children chatting on their phones or sending short messages has disappeared.

    A grade — 2 student said, "I couldn't concentrate during classes if the cell phone was with me. I couldn't help

checking if there were messages or missed phone calls. I even played games on the phone sometimes."   

    The school authorities say they feel the ban is necessary to keep order in class. They even gave out an open

letter to remind parents not to let their children bring mobile phones to school. More than 96 percent of parents

say they welcome the school decision. The school is also being flexible (灵活的) in implementing the ban. Those

students who live far from school are allowed to bring mobile phones to contact their parents. But they still have

to switch them off in classrooms.

    Medical experts have also welcomed the school decision. They say too much dependence on mobile phones

can cause many psychological problems in teenage students.

1. The grade--2 student thought that _______. [ ]

A. the mobile phone should be on during classes

B. it is good to play cell phone games sometimes

C. the mobile phone is helpful to her studies

D. it is no good to use the cell phone at school

2. According to the passage, the students use their mobile phones except _______. [ ]

A. contacting their parents

B. cheating in exams

C. sending short messages

D. playing games

3. Which of the following is TRUE according to the passage? [ ]

A. All the parents welcome the school decision.

B. Some students can bring mobile phones to school.

C. Medical experts are against the school decision.

D. No one is allowed to bring his mobile phone to school.

4. What does the underlined word "implementing" in paragraph 3 probably mean? [ ]

A. Carrying out.

B. Giving up.

C. Making up.

D. Finding out.

5. The passage mainly tells us               . [ ]

A. the mobile phone is a big trouble to teenage students

B. the use of the mobile phone can cause mental problems

C. about a ban on the mobile phone in a middle school

D. a story happening at Shanghai Xianxia Middle School

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