欧姆定律是个实验定律，它有一定的适用范围，除对金属外，还适用于（ ） A．电解质

      清晨，一位清洁工人正拿着扫帚打扫街道。一个学生无视近在咫尺的垃圾桶，将手中的香蕉皮扔到了刚刚打扫干净的路上。清洁工人说：“同学，请不要乱扔垃圾。” 那个学生眼一斜：“我不扔，要你扫地的干什么？”此时，如果你在现场，你会对这位学生怎么说？

电子显微镜（）

The surprising experiment I am about to describe proves that air is all around you and that it presses down upon you. Air pressure is a powerful force. When you swim underwater, you can feel water pushing down on your body. The air all around you does the same. However, your body is so used to it that you do not notice this. The pressure is caused by a layer of air called the atmosphere. This layer surrounds the Earth, extending to about five kilometers above the Earth’s surface.

The following experiment is an easy one that you can do at home. But make sure that you are supervised, because you will need to use matches. Now for the experiment！

What you need

•A hard-boiled egg without the shell

•A bottle with a neck slightly smaller than the egg

•A piece of paper

•A match

Method

1） Check that the egg will sit firmly on the neck of the bottle.

2） Tear the paper into strips and put the strips into the bottle.

3） Light the paper by dropping a burning match into the bottle.

4） Quickly sit the egg on the neck of the bottle.

Result

Astonishingly, the egg will be sucked into the bottle. Your friends will be amazed when you show them the experiment. But be careful when you handle matches.

Why it happened

As the paper burns, it needs oxygen and uses up the oxygen （air） in the bottle. The egg acts as a seal in the neck of the bottle, so no more air can get inside. This reduces the air pressure inside the bottle. The air pressure must equalize, so more air from outside must enter the bottle. The outside air pressure against the egg and then the egg is pushed into the bottle! This proves that air is all around and that it is pressing down on it.

小题1:Why is there the need to take care when you are doing the experiment?

A．The bottle could break.

B．You need to light the paper with a match.

C．The egg needs to be shelled.

D．The egg has to be perfectly placed on the neck of the bottle.小题2:In the experiment, the burning inside the bottle can___.

A．equalize the air pressure inside and outside

B．make a seal in the neck of the bottle

C．finish up the oxygen inside the bottle

D．produce more oxygen inside the bottle小题3:How did the egg put into the bottle？

A．The oxygen inside the bottle sucked the egg in.

B．It became saft without the shell.

C．The neck of the bottle was wide enough.

D．The outside air pressure forced it into the bottle.小题4:The experiment is carried cut to prove ______.

A．water pushes on your body when you swim underwater.

B．the earth is surrounded by a layer of air called the atmosphere.

C．the pressure of air around us has a powerful force.

D．the air pressure is not equalized around us.

银行营业利润率指标正确的计算公式是营业利润率等于( )。

A．利润总额/实收资本×100%
B．利润总额/贷款余额×100%
C．利润总额/营业收入×100%
D．利润总额/(营业收入-金融机构往来收入)×100%

不属于1986年1月1日生效的SDR货币篮中的货币是（）

A.美元

B.卢布

C.日元

D.英镑