CTCS2-200H型车载列控系统主机与外部连接的电缆CN1、CN2、CN3、CN4、CN5、CN6、CN7、CN8各起什么作用？

我国交通系统的对外帐务结算机构是（）.

A:CN03 B:CN01 C:CN D:CN01和CN03

我国对外帐务结算机构代码是（）

A:CN03 B:CN01 C:CN D:CN01和CN03

我国对外帐务结算机构是（）

A:CN01 B:CN03 C:CN D:CN01/CN03

T6R的RXRF模块CN2与DSP模块的接口（）相连。

A:CN1 B:CN2 C:CN3 D:CN4

T6R的前面板模块CN1与DSP模块的接口（）相连。

A:CN1 B:CN2 C:CN3 D:CN4

中国的教育机构使用的域名的后缀是

A:edu.cn B:com.cn C:gov.cn D:net.cn

在北京奥运会上获得比赛前三名的选手都将挂上既体现奥运理念，又体现中华民族特色的奖牌――用一种玉石制作然后分别镀上金、银、铜而成的奖牌。刘星是个爱动脑筋的孩子，当他得到一小块制作奥运奖牌余下的玉石材料后，立即着手利用家里的弹簧秤测这种材料的密度。请你和刘星一起来完成测量过程。（g取10N/kg）

（1）右图甲所示用细线拴住玉石块，用弹簧秤测出其所受重力，这时弹簧秤示数是_______N，从而可计算出玉石块的质量。

（2）如图乙所示让玉石块完全浸入水中，从图中弹簧秤的示数可计 算出玉石块所受的浮力是__________N。

（3）利用以上测量数据可计算出玉石块的密度______kg/m³。

（每空1分，共3分）3.6　0.8　4.5×10³

Maybe ten-year-old Elizabeth put it best when she said to her father, "But, Dad, you can't be healthy if you're deaD."

Dad, in a hurry to get home before dark so he could go for a run, had forgotten to wear his safety belt-- a mistake 75% of US population make every day. The big question is why.

There have been many myths about safety belt ever since their first appearance in cars some forty years ago. The following are three of the most common.

Myth the Number One: It's best to be "thrown clear" of a serious accident.

Truth: Sorry, but any accident serious enough to "throw you clear" is able going to be serious enough to give you a very bad landing. And chances are that you'll have traveled through a windshield（挡风玻璃）or door to do it. Studies show that chances of dying after a car accident are twenty-five times in cases where people are "thrown clear".

Myth Number Two: Safety-bets "trap" people in cars that are burning or sinking in water.

Truth: Sorry again, but studies show that people knocked unconscious（昏迷）due to not wearing safety belts have a greater chance of dying in these accidents. People wearing safety belts are usually protected to the point of having in these accidents. People wearing safety belts are usually protected to the point of having a clear head to free themselves from such dangerous situation, not to be trapped in them.

Myth Number Three: Safety belts aren't needed at speeds of less than 30 miles per hour（mph）.

Truth: When two cars traveling at 30 mph hit each other, an unbelted driver would meet the windshield with a force equal to diving headfirst into the ground from a height of 10 metres.

41. Why did Elizabeth say to her father, "But, Dad, you can't be healthy if you're dead"?

A. He was driving at great speeD.

B. He was running across the street.

C. He didn't have his safety belt on.

D. He didn't take his medicine on timE.

42. The reason father was in a hurry to get home was that he __________.

A. wasn't feeling very well B. hated to drive in the dark

C. wanted to take some exercise D. didn't want to be caught by the people

43. According to the text, to be "thrown clear" of a serious accident is very dangerous because you ________.

A. may be knocked down by other cars.

B. may get serious hurt thrown out of the car

C. may find it impossible to get away from the seat

D. may get caught in the car door

44. Some people prefer to drive without wearing a safety belt because they believe _______.

A. the belt prevents them from escaping in an accident

B. they will be unable to think clearly in an accident

C. they will be caught when help comes

D. cars catch fire easily

45. What is the advice given in the test?

A. Never drive faster than 30 miles an hour.

B. Try your best to save yourself in a car accident.

C. Never forget to wear the safety belt while driving.

D. Drive slowly while you're not wearing a safety belt.

CCBAC