(12分)某研究性学习小组为了制作一个传感器,需要选用某种电学元件。实验中首先要

题型:实验题

问题:

(12分)某研究性学习小组为了制作一个传感器,需要选用某种电学元件。实验中首先要描绘该元件的伏安特性曲线,实验室备有下列器材:

A.待测元件(额定电压2V、额定电流200mA)

B.电流表A1(量程0~0.6A,内阻约为0.5

C.电流表A2(量程0~0.3A,内阻约为1

D.电压表V(量程0~3V,内阻约为10k

E.滑动变阻器R1(阻值范围O~lk,允许最大电流l00mA)

F.滑动变阻器R2(阻值范围0~5,允许最大电流1A)

G.直流电源E(输出电压3V,内阻不计)

H.开关S,导线若干

①为提高实验的准确程度,电流表应选用____;滑动变阻器应选用      (以上均填器材代号)。

②请在图中用笔画线代替导线,完成实物电路的连接。

③根据你的实物电路连接图在右边方框内画出实验电路图。

考点:实验:伏安法测电阻实验:练习使用示波器实验:测绘小灯泡的伏安特性曲线实验:探究影响导体电阻的因素
题型:实验题

情景对话。从所给的选项中选择恰当的句子补全对话(此题有两个多余选项)。

Policeman: Good morning madam.  1            

Mrs Lee: Oh, officer, it's my Ned. He's run away from home.

Policeman: When did you last see Ned?

Mrs Le :   2  

Policeman: How did he seem? Was he acting strangely?

Mrs Lee: No, not at all. He seemed completely normal.

Policeman : How old is Ned?

Mrs Lee: He's twelve.

Policeman:    3  

Mrs Lee: None. Why do you ask ?

Policeman: Well, because he can't have gone very far without any money.

Mrs Lee:    4  

Policeman: I can't say exactly, Mrs Lee, but I hope we'll find him very soon. Now can you

                  tell  me what Ned looks like?

Mrs Lee: Certainly. He's got long floppy (松弛下垂的) ears, a short tail and...

Policeman: What?  5  

A. How much money did he have?

B. He was born in January.

C. At 6 o'clock yesterday evening.

D.  You mean Ned isn't your son.  He's your dog!

E. How often do you visit him?

F. What can I do for you?

G.  How long will it take you to find him?

题型:实验题

对于白内障以下哪种说法不恰当()。

A.白内障是一种可复明的疾病

B.患白内障后均需手术治疗

C.大多数成年人的晶状体会有不同程度的轻微混浊

D.老年性白内障随年龄增加患病率明显增加

E.老年性白内障常双眼患病,但严重程度可不一致

题型:实验题

阅读下面的文字,完成1~4题。

锦瑟

李商隐

锦瑟无端五十弦,一弦一柱思华年。庄生晓梦迷蝴蝶,望帝春心托杜鹃。

沧海月明珠有泪,蓝田日暖玉生烟。此情可待成追忆?只是当时已惘然。

1.此诗首联运用怎样的修辞手法表现了诗人怎样的情怀?

_____________________________________________

2.颔联借助什么表现手法表现了诗人怎样的情感?

_____________________________________________

3.颈联写了什么内容?

_____________________________________________

4.尾联是怎样表现诗人思想感情的?试分析。

_____________________________________________

题型:实验题

精子能活动,但方向不定,带有回旋,应判为

A.活动力良好

B.活动力较好

C.活动力不良

D.无活力

E.以上都不是

题型:实验题

农合机构单独出手建筑物或土地附着物时,按销售不动产()的税率计算缴纳营业税。

A、1%

B、2%

C、3%

D、5%

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