问题 问答题 简答题

决定钢轨重量的主要因素是什么?

答案

参考答案:

1.钢轨重量要与机车车辆轴重相匹配,轮轴比2.75以上为合理。

2.在一定行车速度下,列车动力作用引起的轨道各部件的震动加速度与钢轨质量成反比,因此要提高行车速度,又要保证线路质量,就必须提高钢轨重量。

3.必须根据年通过总重密度合理选择匹配的钢轨重量。

单项选择题
阅读理解

阅读理解。

     Geneva is situated between the Jura Range and the Alps on the western end of Lake Geneva. Capital

of Peace is one of its names- the European headquarters of the United Nations lies here in Palais des

Nations. Another worthy name for this city with a humanitarian tradition (人道主义传统) and international

character is the World's Smallest Metropolis. Parks, splendid stores and lively streets in the old part of town

and its 2000-year history wait to be discovered.

     The Jet d'Eau together with the Flower Watch are the main attractions every year for the tourists visiting

Geneva. The Jet d'Eau has become the symbol (象征) of Geneva for a long time. This is a 140 meters high

water monument with a rich history. Eight 13,500-watt projectors light the grand column (圆柱) of the

fountain in the evening, from early March until the second Sunday of October. The Flower Watch, which

was created at the edge of the English Garden in 1955, reminds us about that Geneva is the birthplace of

the Swiss clock and watch making, and that this industry has become internationally famous, as well through

the quality of the watches as through their beautiful appearance.

     Sails on Lake Geneva are also enjoyable. The Lake of Geneva, lying among the Alps, is a true inland sea,

making possible a wide range of pleasant boat trips, you can relax and watch the beautiful scenes pass by.

1. Which of the following is NOT suitable for describing Geneva?

A. Capital of Peace.

B. Palais des Nations.

C. The World's Smallest Metropolis.

D. The birthplace of the Swiss clock and watch making.

2. The Jet d'Eau in the second paragraph refers to _____.

A. the water fountain

B. the English Garden

C. a new scene with electric lighting

D. the name of a famous watchmaker

3. What do we learn about the Lake of Geneva from the text?

A. It is the symbol of Geneva.

B. It lies among the Jura Range.

C. It has a direct passage to the ocean.

D. It is a large body of water of tourist interest.