问题 实验题

某同学测量一只未知阻值的电阻。

(1)他先用多用电表进行测量,按照正确的步骤操作后,测量的结果如图所示,请你读出其阻值大小为_____________。为了使多用电表测量的结果更准确,该同学接着测量前应该完成下列步骤中的_____________。

A.换“×1”档再机械调零

B.换“×1”档再欧姆调零

C.换“×100”档再机械调零

D.换“×100”档再欧姆调零

(2)用下图给出的器材,测量一只标有“3V、0.6W”的小灯泡正常发光时的电阻R1。实验过程要求尽量减小误差(滑动变阻器最大阻值为10Ω;电源电动势为12V,内阻为1Ω;电流表内阻约为1Ω,电压表的内阻约为10kΩ)。

①电流表应选用的量程是_____________A(选填“0.6”或“3”),电压表应选用的量程是_____________V(选填“3”或“15”);

②请将你设计的实验电路图,画在虚线框中;

③根据②中的电路图,用笔画线代替导线,完成图中的实物连接;

④用此电路进行测量,其测量值_____________(填“等于”、“小于”、“大于”)真实值;

⑤若小灯泡发光较暗时的电阻为R2,你根据所学的知识可判断出R1与R2的大小关系是R1_____________R2(选填“大于”、“等于”或“小于”)。

答案

(1)1000Ω,D

(2)①0.6,3

④小于

⑤大于

阅读理解

阅读理解。

     Kids who receive special education are, without doubt, the hardest working children in any school.

When they are having difficulty learning basic literacy and number concepts, when they break rules,

when they need more services, support and adult attention than their peers, then they are struggling the

hardest. In psychology, we are trained to think that if we are feeling angry or confused when sitting with

a patient, then we are probably feeling just what our patient is feeling.The same is true for students with

disabilities. Whatever we feel when we work with them, they are probably feeling as they work with us.

     If you have a disability that affects your education, then you have a brain disorder.Because education,

even in mathematics, is largely verbal (用言辞), most brain disorders responsible for educational disabilities

affect language, and how you process words and ideas in written and oral form. To imagine how much

effort a child with a language disability spends each school day, imagine yourself attending a school today

taught in a language you had a basic understanding of. Imagine though, that while you seem fluent to others,

you have trouble when people talk too fast, use idioms or expressions.

     When adults and classmates blame, or criticize kids who receive special education, they are struggling

with their own confusion.It is difficult to imagine the world as it is lived by someone with an educational

disability. It is difficult to understand how someone who can be so "normal" can have so many problems.

It is so easy to imagine that if they just tried harder...without understanding that just to do the ordinary, kids

with disabilities are making an extraordinary effort.

1. What is the purpose of the author by writing the passage?

A. to introduce how hard to be a special education teacher.

B. to think highly of the children with disabilities.

C. to show the disabled have much trouble in understanding.

D. to call on the society to care for the disabled.

2. If a disabled kid learns number concepts, he ______.

A. won't work as hard as a normal.

B. will work double as hard as a normal.

C. will be as patient as the normal.

D. will think of his disability first.

3. If a kid has a disability affecting his education, he will ______.

A. have a hard time using the language.

B. be too foolish to learn maths.

C. not understand what others are saying.

D. have a lot of trouble in remembering words.

4. Before you intend to blame a kid receiving special education, _______.

A. you should try to understand what he is saying.

B. you should imagine the world he lives in.

C. you should imagine yourself in his shoes.

D. you should think of the education he has received.

单项选择题