问题 问答题 简答题

高速受电用的接触网应具备的要求?

答案

参考答案:(1)在最高行车速度和更大的速度变化范围内应能保证正常供电。(2)应有更高的耐磨性和抗腐蚀能力。(3)对接触网的结构和布置应有更高的要求。(4)在接触网的接触悬挂方面,目前在常速列车供电中采用的弹性半补偿链形悬挂和弹性全补偿链形现挂已不能适应高速的要求,应该有更先进的接触悬挂装置。

听力题

小题1:.The ______ (多数人) of the employees in the company have

university degrees.                                                                       

小题2:. Very few people have ______ (成功) in losing weight.                      

小题3:. Although the two problems are very ______ (相似的), we can

find some differences.                                                                   

小题4:. It is no use ______ (后悔) your past mistakes.                                        

小题5:.Dave has visited many other places of interest in Beijing ______

(除了) the Summer Palace.                                                            

小题6:.. Earthquake are ______ (极其) difficult to predict.                                  

小题7:.______ (品尝) this coffee and see if you should add some more

sugar to it.                                                                                    

小题8:. The careless driver was to ______ (责备) for the accident which

had cost one passenger his life.                                                              

小题9:. It’s considered good ______ (礼貌) in some countries to leave a

little food on your plate.                                                                

小题10:.   Is it ______ (方便) for you to buy me something to eat when

you go out?                                                                                  

多项选择题