当跨距很小时,接触线张力的变化取决于()的变化。A.弛度 B.挠度 C.负载 D.温

题型:单项选择题

问题:

当跨距很小时,接触线张力的变化取决于()的变化。

A.弛度

B.挠度

C.负载

D.温度

考点:接触网工考试高级接触网工高级接触网工题库
题型:单项选择题

肌肉注射阿片类药物是临床一直沿用的术后镇痛经典方法,但是因为血药浓度波动很大,其效应难以预测。

题型:单项选择题

阅读理解。

     Generally speaking, nobody would like to put themelves into troubles what is actually a simple case.

It seems that some people go out of their way to get into trouble. That's more or less happened on the

night that Nashville police officer Floyd Hyde was on duty.

     "I was on the way to a personal-injury accident in West Nashville. As I got onto Highway 40, blue

lights and sirens(警笛) going, I fell in behind a gold Pontiac Firebird that suddenly seemed to take off

quickly down the highway. The driver somehow panicked at the sight of me. He was going more than

a hundred miles an hour and began passing cars on the shoulder."

     But Hyde couldn't go after him. Taking care of injured people is always more important than worring

about speeders, so the officer had to stay on his way to the accident. But he did try to keep the Firebird

in sight as he drove, hoping another nearby unit(附近的警局)would be able to step in and stop the

speeding car. As it turned out, keeping the Firebird in sight was not that difficult. Every turn the Pontiac

made was the very turn the officer needed to get to the accident scene.

     Hyde followed the Pontiac all the way to his destination. At that point he found unit had already

arrived at the accident scene. His help wasn't needed. Now he was free to try to stop the driver of the

Firebird, who by this time had developed something new to panic about.

     "Just about that time," Hyde says. "I saw fire coming out from under that car, with blue smoke and

oil going everywhere. He had blown his engine. Now he had to stop."

     "After I arrested him, I asked him why he was running. He told me he didn't have a driver's license".

     That accident cost the driver of the Firebird plenty extra --- a thousand dollars for the new engine ---

not to mention the charges for driving without a license, attempting to run away, and dangerous driving.

1. The meaning of "go out of one's way" (in Para. 1) probably means ______

A.changing directions        

B.forgeting duties  

C.speeding up              

D.taking trouble to do something 

2. Why did the driver of the Firebird suddenly speed down the highway?

A.Because he thought the police officer wanted to stop him.

B.Because he realized he had to hurry to the accident scene.

C.Because he was racing with another driver on the road.

D.Because he wanted to overtake other cars on the shoulder. 

3. Which of the following statements is TRUE?

A.Someone else was taking care of the injured person.

B.The Pontiac reached its destination at the accident scene.

C.Hyde knew where he was going by following the right car.

D.The policeman was running after a speeder on Highway 40. 

4. The driver of the Firebird         .

A.took a wrong turn on the way        

B.was stopped by the police officer

C.had some trouble with his car       

D.paid for the expenses of that accident

5. What is probably the best title for the passage?

A. Losing His Way                  

B. Going My Way

C. Fun on the Way                    

D. Help on the Way

题型:单项选择题

白茶依茶树品种不同分为()。

A.大白茶

B.水仙白茶

C.小白茶

D.杂白茶

题型:单项选择题

2016年6月23日,英国举行脱离欧盟全民公投,脱欧阵营以51.9%对留欧阵营48.1%的微弱得票优势胜出,英国成为首个投票脱离欧盟的国家,为欧洲一体化进程带来变化。导致英国“脱欧”的因素主要有()。

A.英国不愿受欧盟某些监管规则束缚

B.英国始终反对欧洲一体化

C.欧洲遭遇史上最大难民潮冲击

D.英国“疑欧主义”传统

题型:单项选择题

及时响应是实时操作系统和【 】的特征。

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