滑动变阻器是通过改变连入电路中电阻丝的______来改变电阻的．欧_爱下问搜题

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问题填空题

滑动变阻器是通过改变连入电路中电阻丝的______来改变电阻的．欧姆定律的数学表达式是______．

答案

滑动变阻器是通过改变连入电路中电阻丝的长度来改变电阻的．欧姆定律的数学表达式是I=

U

R

．

故答案为：长度；I=

U

R

．

完形填空

I have a friend named Monty Roberts who owns a horse ranch(牧马场).He has let me use his      36    to raise money for youth at risk programs.
The last time I was there he told me his story.when he was young, his family is too    37   to have a house to live in.As a    38   , when he was in high school, he was asked to write a paper about    39    he wanted to be and do when he grew up.That night he wrote a seven-page paper describing his goal of    40    a horse ranch.He also drew a picture to show a 4,000-square-foot house that would sit on a beautiful farm.The next day he handed it in to his   41  .Two days later he received his paper back.On the front page was a large red F.Roberts asked, “Why did I receive an F?” He teacher said, “This is a(an)   42   dream for a young boy like you.Owning a horse ranch requires a lot of money.” Then the teacher added, “If you will rewrite this paper with a more realistic goal, I will reconsider your    43  .”
The boy went home and thought about it for a    44   and hard time.He asked his father what he should do.His father said, “Look, son, you have to    45  your own mind on this.Finally, after sitting with it for a week, the boy turned in the same paper, making no    46  at all.He told his teacher “you could keep the F and I    47  keep my dream.
Monty tell me this   48   because I am sitting in his 4,000-square-foot house in the middle of my 200-acre horse ranch.He said a lot of kids’s    49  can be stole.Don't let anyone steal your dreams.Follow your heart, no matter what.   50  he had enough gumption(毅力) not to give up my dream.

D．unrealistic

D．Fortunately

多项选择题

行政程序的价值体现在( )。

A．保障行政相对人的权利

B．扼制行政主体自由裁量的随意性

C．避免行政复议的提起

D．在行政公正和效率之间起到平衡的作用

E．有助于提高行政效率