因生产部位用电造成事故或火警造成短路跳闸，必须查清原因并排除故障方可恢复送电，否则造

系统符号常量的定义可以通过______获得。

测中心静脉压时，测压玻璃管的零点应取平于

A．锁骨中点

B．右心房中点

C．右心室中点

D．剑突

E．胸骨柄

长方形的面积=______．正方形的周长=______．

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 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.

小题1: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.小题2: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小题3: 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小题4: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小题5: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.

在开始进行双语教学探索时，可先选择（）等学科。在积累一定的经验之后，再逐渐推广到其他学科。

A、语文

B、思想品德

C、中国历史

D、电子信息