钢包保护套管的作用是减少散热。

题型:判断题

问题:

钢包保护套管的作用是减少散热。

考点:连铸工考试连铸工考试题库
题型:判断题

阅读理解。

     F1 is a very fast car race. It is one of the most popular sports in the world. The drivers go at over

300 kilometers an hour every race. But F1 cars didn't always go so fast.

     In 1895, the first F1 race began in France. During that race, it took the drivers 48 hours to finish

580 kilometers. In 1901, the best drivers had an average (平均) speed of 100 kilometers an hour.

Modern grand prix (奖品) F1 racing began in 1950 in Britain. Grand prix is French. It means "large

prize". Today, 12 teams and 24 drivers race to get points. There are races at different tracks (路线) all

over the world from March to October every year. There are also F2 and F3 racing. But the cars are

slower and less high-tech.

    During a F1 race, drivers have to make several stops to change tyres(轮胎) and put more petrol in

their cars. A team of people do these tasks together to make the stops short. Some people lift the car

up, others change the tyres. While this team works on the tyres, another person puts petrol in the car

and a different person cleans the driver's helmet. One more person talks to the driver about how to win.

It's amazing that all those people finish it in just a few seconds!

     During 100-meter races, people count the athletes' speed by 1/100th (0. 01) of a second, for example

10.81 seconds. In the world of car racing, however, the race has to be timed to 1/1,000th(0. 001) of a

second. That is 50 times faster than the time for a blink (眨眼).

     F1 cars look very colorful. First, cars of different teams have different colors. Then there are a lot

of advertisements on the cars.

1. The best drivers in F1 races can reach the speed of ____ an hour.

A. 100 kilometers

B. 300 kilometers

C. 580 kilometers

D. 1,000 kilometers

2. Modern grand prix F1 racing first began ____. 

A. in France

B. in Britain

C. in 1895

D. in 1901

3. Today F1 race is held ____. 

A. at different tracks all the year round

B. every month all over the world

C. from March to October every year

D. in France and Britain every year

4. When the driver makes stops in a race, a team of people will ____.  

A. help him make the stops short

B. lift the car up and change the tyres

C. put petrol in the car and clean the car

D. clean the driver's helmet

5. In the world of car racing, the race has to be timed to ____. 

A. second 

B. 10. 81 second

C. 1/100th of a second

D. 1/1,000th of a second

题型:判断题

已知25℃时的脱氧清水需氧量为1800kgO2/d,EA=10%,则实际供气量为______m3/d。

A.60000
B.50000
C.4000
D.300

题型:判断题

应用于人际关系的健康教育行为改变理论包括()

A.社会认知理论

B.社会网络与社会支持

C.紧张和应对互动模式

D.创新扩散理论

E.行为变化阶段模式

题型:判断题

影响轧制力的因素是什么?并说明怎样影响?

题型:判断题

检测机构应按()的要求对自动消防系统进行检测,并如实填写《建筑消防设施检测记录表》。

A、建筑设计防火规范

B、建筑消防设施检测技术规程

C、有关气瓶安全监察规程

D、建筑消防设施维护保养规定

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