问题 实验题

如图所示,Ⅰ、Ⅱ、Ⅲ三条线分别表示多用电表指针的指示位置。将选择开关置于直流“50V”挡,Ⅱ的示数为______V;选择开关置于直流“100mA”挡,Ⅰ的示数为______mA;将多用电表选择开关置于“×10Ω”挡,Ⅲ的示数是____Ω。若接着要测阻值约为30Ω的电阻,应采取的测量步骤是:__________________________________。

答案

19.9,249;1200。倍率挡选择至×1Ω挡,红黑表笔短接调节欧姆零点,再分别接电阻两端进行测量。

阅读理解

The size and shape of your ears show your character more than any other part of the face. Other parts of the face change shapes as we get older, but ears do not change their shapes. They only change in size.

Reading people’s character from their ears is a very old science. In the past people thought that a person’s ears with color was dangerous. They also thought that the shape of the ears showed if a person was musical or not. Today,too many people believe that the size and shape of the ears help you know if a person is musical.

Ears are all different,and each different thing has a meaning. Next time you look at a person,see if his or her ears are large,medium-size,or small. Look at the lobes(耳垂).Do they stick to the face? Ears that are always red mean that a person may get angry easily. Ears that are always cold and nearly white color mean that a person has a nervous character.

小题1:When a baby is born, ________.

A.his/ her ears are red

B.his/ her ears will not change all the life

C.his/ her ears will not change in shape

D.he/ she will get large ears小题2:Reading people’s character from their ears is ____________.

A.only for music

B.an old idea

C.very new

D.a good way to talk with others小题3:When one’s ears are red, it means________.

A.he is a kind man

B.he is very happy

C.he may get angry easily

D.he drinks too much小题4:If you look at someone’s ears, the right way is________.

A.to look at his face, ears and nose

B.to look at the size, color and shape

C.to look at his mouth, eyes and nose

D.to look at the hair, eyes and color小题5:Which may be the best title of the article?

A.Looking at a person in the right way

B.Ears and colors

C.The change of ears

D.Ears and characters

填空题