问题 问答题 论述题

车轮踏面圆周磨耗超限有那些危害?

答案

参考答案:

踏面磨耗后,破坏了踏面斜度,影响运行的平稳性,增大了车轮和钢轨间的接触面积,使摩擦力增大,增加了车辆在线路上的运行阻力;轮缘高度相应加高,可能会撞击和剪断钢轨连结螺栓,引起车辆颠覆事故。

阅读理解

The Lunar Calendar(阴历)

Modern Chinese use the solar calendar(阳历)as English people do . But at the same time , they use their own lunar calendar . Each lunar year is given the name of one of these animals : the rat , the ox , the tiger , the hare , the dragon , the snake , the horse , the goat , the monkey , the chicken , the dog and the pig . This list lasts for 12 years and then starts again .

Each Chinese month starts on the day of the new moon . And the full moon comes on the 15th day of the month . The New Year always starts between January 21 and February 20 . On the last day of the lunar year , there is a big family dinner . All members of the family except married daughters try to be present at this meal , even of they have to travel many miles to reach the home of their parents . Old quarrels are forgotten , and everybody is happy . After the dinner , the children keep awake to welcome the New Year .

The New Year celebrations last for 15 days , from the new moon to the full moon . On the first day , children and unmarried people go to visit their elders .

小题1:If next year is the year of the dragon , what was the name of last year ?

A.It was the year of tiger .

B.It was the year of the hare .

C.It was the year of snake .

D.It was the year of the ox .小题2:Suppose that next Chinese New Year’s Day is on 15th February , when will people have their big family dinner ?

A.On February 15

B.On February 16

C.On February 14

D.On February 17小题3:The family usually have their big family dinner at the home of ________ .

A.the married son

B.the married daughter

C.the unmarried son

D.the parents小题4:People celebrate the New Year ________ .

A.for 15 days

B.from the new moon to the full moon in the first month of the lunar year

C.from January 21 to February 20

D.both A and B小题5:From this selection we know that each Chinese month is measured by _______ .

A.the sun’s revolutions(旋转)

B.the moon’s revolutions

C.the earth’s revolutions

D.both the earth’s and moon’s revolutions

单项选择题