题干

按照示例完成下表.

物质

性质

用途

示例:一氧化碳

可以燃烧,并放出大量的热量

作燃料

①金刚石

     ____

刻划玻璃

②氮气

化学性质不活泼

     ____

③氧气

     ____

     ____

④     ____

     ____

     ____

上一题 下一题 0.0难度 选择题 更新时间:2019-08-14 03:43:38

答案(点此获取答案解析)

天然存在的最硬的物质,常用作保护气,支持燃烧,炼钢,二氧化碳,干冰升华时吸热,人工降雨

同类题1

(A)信息归纳:阅读下面的短文,根据短文内容完成信息卡。

    According to a new survey, student safety has become a big problem.Now in many big cities of China, many schools start a new lesson: self­protection. Students like this lesson because there are no exams or boring classes. And they can learn how to save lives and know how to stop danger before it really happens.

    Lin Li, a teacher from Yantai, gives young students advice on how to deal with danger.

    If you are in a traffic accident

    If a car hurts you, you should remember the car number.If it is a bicycle, try to call your parents before you let the rider go.This is because you don't know how seriously you are hurt.

    If it is raining hard and there is lightning

    Don't stay in high places and stay away from trees.

    When there is a fire

    Get away as fast as you can.Put wet things on your body and try to find an exit.Do not take the lift.

    If someone is drowning

    If you can't swim, don't get into the water.Cry out for help.

Remember that danger is never as far away as you think.Take care of yourself at all times!

    If you are robbed (抢劫)

    Keep calm.If you cannot cry for help or run away, give the robber your money.Try to remember what the robber looks like and tell the police later.

Information Card

Best title:____

Danger

What to do

____

If hit by a car, you're supposed to ____.

If hit by a bike, call your parents.

Raining with

lightning

Stay at low places and keep away from trees.

Fire

Don't take the lift and find an ____ as fast as you can.

Drowning

If you can't swim, just shout “Help!”

Robbery

Keep clam.

Remember the robber's ____ and tell the police later.