问题 选择题

关于磁通量的描述,下列说法正确的是:

A.置于磁场中的一个平面,当平面垂直磁场时穿过平面的磁通量最大

B.如果穿过某平面的磁通量为零,则该处的磁感应强度不一定为零

C.若穿过平面的磁通量最大,则该处的磁感应强度一定最大

D.将一平面置于匀强磁场中的任何位置,穿过该平面的磁通量总是相等

答案

AB

题目分析:磁通量,其中当B与线圈平面垂直,磁通量最大,所以A对C错。当线圈平面与磁场平行时,磁通量为零,所以B对。在同一匀强磁场中,将线圈平面反转180°,线圈内的磁通量改变,所以D错

点评:本题考查了磁通量的理解,磁通量为标量,可以利用磁感线的根数来间接反映磁通量的大小。

阅读理解

I was quite close to my grandmother, Julia. We lived with her and then she lived with us. She was a very nice person, both kind and patient. She taught me to read and write when I was young and helped me to be interested in stories and poems.

In my mind, my grandmother was a great tailor. She made clothes or toys better than anything you can buy in a shop today. She always made clothes for family and friends.

My grandmother was also a hard worker both at home and at work. I can still remember the difficult time when we were very poor. At that time, my grandmother was already sixty years old but she worked in a hospital for a long time every day--not in the office but doing the cleaning outside and taking care of me at the same time while my mom was at work!

My brother and sisters also love her. We will never forget our grandmother. She is really important in our lives and is always there for all of us in one way or another. I am proud to be her grandson.

小题1:The writer's grandmother taught him to         when he was young.

A.read and write

B.sing and dance

C.draw and sing

D.play and learn小题2:His grandmother always made          for family and friends.

A.cakes

B.cards

C.meals

D.clothes小题3:While his mom was          , his grandmother took care of him.

A.at home

B.at work

C.out of work

D.in hospital小题4:At the age of 60, his grandmother         in a hospital for a long time every day.

A.made fine toys

B.worked in the office

C.did the cleaning

D.stayed with his mother

单项选择题