【题目】有一灯泡上标有“6 V 0.1 A”字样,现要测绘该灯泡的伏安特性曲线,有下列器材可供选用
A.电压表(0~5 V,内阻2.0 kΩ)
B.电压表(0~10 V,内阻3.0 kΩ)
C.电流表(0~100m A,内阻2.0 Ω)
D.电流表(0~6 A,内阻1.5 Ω)
E.滑动变阻器(30 Ω,2 A)
F.滑动变阻器(100 Ω,0.5 A)
G.学生电源(直流9 V)及开关、导线等
(1)实验中所用的电压表应选________,电流表应选________,滑动变阻器应选________。
(2)画出实验电路图,要求电压从零开始测量。
(3)根据你的实验电路,将图中所示的器材连成实验电路。
(4)该同学描绘出的IU图像应是图中的________。
科目:高中地理 来源: 题型:
【题目】短文改错。
假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。错误仅涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏字符号(),并在其下面写出该加的词。
删除:把多余的词用(\)划掉。
修改:在错的词下划一横线,并在该词下面写出修改后的词。
注意:1. 每处错误及其修改均仅限一词;
2. 只允许修改10处,多者(从第11处起)不计分。
Walking is an useful way of exercising and is good for our health. It can not only reduce the risk of many kinds of diseases but also builds up the bones. It’s safe than many other ways of exercising, and it’s easy to do without consider rules. Beside, walking can also help us lose weight.
What should we pay attention during the walk? First, we should wear loose clothes or good shoes. Second, we should walk fast enough to cause us to breathe with difficulty but still be able to talk with. Third, that is very important to walk with our arms moving freely. Most important, we should do it every day.
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科目:高中地理 来源: 题型:
【题目】短文改错
假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏词符号(∧),并在其下面写出该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下划一横线,并在该词下面写出修改后的词。
注意:
1. 每处错误及其修改均仅限一词;
2. 只允许修改10处,多者(从第11处起)不计分。
Mr. Wang and his wife went to the supermarket the last Sunday. They arrived home very lately. On the way upstairs, Mrs. Wang said, "Listen! I can hear someone talk in kitchen." Then they went downstairs and quiet stood there outside the room. "Yes, you are right, "said Mr. Wang. "There are two boy. They are talking!" Then they call out, "Who’s there?" And no one answered. Mr. Wang opened the door quickly and turned on the light. The room is empty. When they saw the radio, they laughed. The radio was still on. "Oh, dear, " he said, "I forgot to turn it off when they left."
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科目:高中地理 来源: 题型:
【题目】把一个3 pF的平行板电容器接在9 V的电池上。
(1)保持与电池的连接,两极板的距离减半,极板上的电荷增加还是减少?电荷变化了多少?
(2)移去电池后两极板的距离减半,极板间的电势差增大还是减小?电势差变化了多少?
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【题目】如图所示,E=10 V,r=1 Ω,R1=R3=5 Ω,R2=4 Ω,C=100 μF。当S断开时,电容器中带电粒子恰好处于静止状态。求:
(1)S闭合后,带电粒子加速度的大小和方向;
(2)S闭合后流过R3的总电荷量。
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科目:高中地理 来源: 题型:
【题目】 短文改错(共10小题;每小题l分,满分10分)
假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下画一横线,并在该词下面写出修改后的词。
注意:
1. 每处错误及其修改均仅限一词;
2. 只允许修改10处,多者(从第11处起)不计分。
Dear Jin Jing,
Your problem is common one among middle school students. Maybe the following advices can help you. First in all, believe in yourself. Your greatest problem is that you lack self-confidence. The first thing you must do it is to smile at your classmates. One smile speaks loud about your wish to make friends than any word. Your smile will show that you are friendly to him. Next, trying talking with a student who is as shy as you or who share the same interest as you. You can discuss your studies with a classmate and you can also talk about your hobbies. Unless anyone is in trouble, you should be ready to help him or her. Once you have confidence, you can make as many friends as possibly.
Yours,
Lily
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【题目】如图是质谱仪的工作原理示意图。带电粒子被加速电场加速后,进入速度选择器。速度选择器内相互正交的匀强磁场和匀强电场的强度分别为B和E。平板S上有可让粒子通过的狭缝P和记录粒子位置的胶片A1A2。平板S下方有磁感应强度为B0的匀强磁场。下列表述正确的是( )
A.质谱仪是分析同位素的重要工具
B.速度选择器中的磁场方向垂直纸面向外
C.能通过狭缝P的带电粒子的速率等于
D.粒子打在胶片上的位置越靠近狭缝P,粒子的比荷越小
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科目:高中地理 来源: 题型:
【题目】在“探究加速度和力、质量的关系”实验中,采用如图所示的装置图进行实验:
(1)实验中,需要在木板的右端垫上一个小木块,其目的是 ;
(2)实验中,已经测出小车的质量为M,砝码(包括砝码盘)的质量为m,若要将砝码(包括砝码盘)的重力大小作为小车所受拉力F的大小,这样做的前提条件是 。
(3)在实验操作中,下列说法正确的是 。(填序号)
A.求小车运动的加速度时,可用天平测出小盘和砝码的质量M′和m′,以及小车质量M,直接用公式求出
B.实验时,应先接通打点计时器的电源,再放开小车
C.每改变一次小车的质量,都需要改变垫入的小木块的厚度
D.先保持小车质量不变,研究加速度与力的关系;再保持小车受力不变,研究加速度与质量的关系,最后归纳出加速度与力、质量的关系
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