中考物理易错题精选120题
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中考英语易错题精选
2015中考英语易错题精选
1.Because he was ill yesterday,so he didn't go to work. (×) Because he was ill yesterday,he didn't go to work. (√) He was ill yesterday,so he didn't go to work. (√)
[析] 用though,but表示\虽然……,但是…… \或用because,so 表示\
因为……,所以……\时,though和but 及because和so 都只能择一而用,不能两者同时使用。
2.The Smiths have moved Beijing. (×) The Smiths have moved to Beijing. (√)
[析] 不及物动词后接名词或代词作宾语时,要在动词之后加上适当的介词;
但不及物动词后接home,here,there等副词作宾语时,动词之后不必加任何介词。 3.The box is too heavy for him to carry it. (×) The box is too heavy for him to ca
中考数学易错题精选有答案解析
中考数学易错题
中考数学错题精选2014年6月 一.选择题(共11小题)
1.如图,直线l1与直线l2相交,∠α=60°,点P在∠α内(不在l1,l2上).小明用下面的方法作P的对称点:先以l1为对称轴作点P关于l1的对称点P1,再以l2为对称轴作P1关于l2的对称点P2,然后再以l1为对称轴作P2关于l1的对称点P3,以l2为对称轴作P3关于l2的对称点P4,…,如此继续,得到一系列点P1,P2,P3,…,Pn.若Pn与P重合,则n的最小值是( )
xK b 1.C om
相切的是( )
7.若关于x的分式方程无解,则a的值为( )新 课 标 第 一 网
8.(
2012 福州质检)方程x2
+3x﹣1=0的根可看作是函数y=x+3的图象与函数y=的图象交点的横坐标,那么用此方3
9.(2012 福州)如图,过点C(1,2)分别作x轴、y轴的平行线,交直线y=﹣x+6于A、B两点,若反比例函数
y=(x>0)的图象与△ABC有公共点,则k的取值范围是( )新 课 标 第 一 网
10.(2012 呼和浩特)已知:M,N两点关于y轴对称,且点M在双曲线
上,点N在直线y=x+3上,设点M的
2
11.(2012 重庆)已知二次函数y=ax2
高中物理易错题精选 电磁感应错题集
高中物理易错题电磁感应第 1 页共8 页秦建涛
第十一章电磁感应错题集
一、主要内容:电磁感应现象、自感现象、感应电动势、磁通量的变化率等基本概念,以及法拉第电磁感应定律、楞次定律、右手定则等规律。
二、基本方法:要求能够从空间想象的角度理解法拉第电磁感应定律。用画图的方法将题目中所叙述的电磁感应现象表示出来。能够将电磁感应现象的实际问题抽象成直流电路的问题;能够用能量转化和守恒的观点分析解决电磁感应问题;会用图象表示电磁感应的物理过程,也能够识别电磁感应问题的图像。
三、错解分析:错误主要表现在:概念理解不准确;空间想象出现错误;运用楞次定量和法拉第电磁感应定律时,操作步骤不规范;不会运用图像法来研究处理,综合运用电路知识时将等效电路图画错。
例1 长为a宽为b的矩形线圈,在磁感强度为B的匀强磁场中垂直于磁场的OO′轴以恒定的角速度ω旋转,设t= 0时,线圈平面与磁场方向平行,则此时的磁通量和磁通量的变化率分别是[]
错解:t=0时,线圈平面与磁场平行、磁通量为零,对应的磁通量的变化率也为零,选A。
错解原因:磁通量Φ=BS⊥BS(S⊥是线圈垂直磁场的面积),磁通量的变化ΔΦ=Φ2-Φ1,两者的物理意义截然不同,不能理解为磁通量为零,磁通量的变化率也
中考英语精选单选题易错题100题(附答
遵义市黔北状元堂教育初中英语精品补习电话:0852-*******
中考英语精选单选题易错题100题
1 What do you think ______solve the problem ?
A you can do
B can you do
C you can do to
D can you do to
2 In the past he often made his sister____, but now he is often made ___by his sister.
A to cry; to cry
B cry; cry
C to cry; cry
D cry; to cry
3 The teacher told us that the sun ____in the east.
A rises
B rose
C raises
D raised
4 He lives in a village _____there are a lot of trees.
A there
B where
C that
D which
5 He _________ Alice for ten years.
A married to
B has married to
C has married
D has
中考物理易错题精选-电功率的综合计算问题练习题
一、初中物理电功率的综合计算问题
1.如图甲所示的电路中,电源电压U 保持不变,R 0为定值电阻。闭合开关,电流表A 的示数为I ,电压表V 1的示数为U 1,电压表V 2的示数为U 2;将滑动变阻器R 的滑片从一端移动到另一端,U 1、U 2随I 变化的关系如图乙所示;则下列说法正确的是( )
A .电源电压为5.5 V
B .滑片在最右端时,定值电阻R 0的功率为6W
C .滑动变阻器的最大阻值为12.5 Ω
D .电灯的电阻随着电流的增大而减小
【来源】2020年中考一轮模拟测试物理试题(一)
【答案】B
【解析】
【分析】
【详解】
由图可知,灯泡L 与R 0、R 组成串联电路,电压表V 2测量L 两端的电压,电压表V 1测量灯泡L 与R 两端的总电压,当电流表的示数变大时,电压表V 2变大,电压表V 1变小,所以U 2-I 的图线为BQ , U 1-I 图线应该为AQ ;
ABC .由图像乙知,Q 点U 1和U 2相等,则此时滑动变阻器两端的电压为零,电阻为零,电压表的示数都是3V ,电路中的电流为2.0A ,所以
03V 2.0R U +=电源…①
当滑动变阻器的滑片移到最左端时,电路中的电流最小为1.0A ,由图像知:电压表V 1的示数为4.5V
中考英语易错题(7)
中考英语易错题(7)
1. change
[误]I want to change my camera with that one.
[正]I want to change my camera for that one.
[析] change for为“以某物为交换物”。而change with则是“随……而变”,如:The wood's colour changed with the season.
2. cheap
[误]A teacher's salary is generally very cheap.
[正]A teacher's salary is generally very low.
[析]工资的高低要用low,cheap是指价格便宜,如果要讲物美价廉则要用not expensive, 如:This car is not expensive.
3. choose
[误]We each had to have a choose of A or B.
[正]We each had to have a choice of A or B.
[析]choice是名词,而choose是动词。
4. class
[误]The class is w
中考英语易错题汇编
中考典型易错题举例分析
2. —_______ do you _______ about spring?
—The flowers and the green trees.
A. How, like B. How, think C. What, think D. What,
like
【解析】此题陷阱选项为A或B或C。这是由于忽略语境造
成的。由答语The flowers and the green trees. 可知,所
问的是“你喜欢春天的什么?”而不是“你觉得春天怎么
样?”。正确答案为D。
1. It is _______ outside. Let’s put on our raincoats and
go out, Tom.
A. cold B. hot C. sunny D. rainy
【解析】此题易误为A。因为这里有个put on短语,如果
不注意raincoats这个词那就很可能草率地选择A。
raincoats是“雨衣”的意思,而不是一般的衣服,那么不
是因为外面“冷”,而是因为“下雨”才穿“雨衣”。正确
答案为D。
3. —What’s your sister like?
—_______.
A. She is a worker B. She likes p
情景交际专练及易错题精选70 题
情景交际专练及易错题精选70 题
情景交际专练及易错题精选70 题
1.-The party is a great success.We've had a good time. --________.
A.It doesn't matter B.No,thanks
C.It's not very good D.I'm glad to hear that 2 .-Mike hurt his arm the day before yesterday .Now he's in hospital.
--________.
A.I'm sorry to hear that B.That's all right C.I hope you'll feel better soon
3.-Would you mind my closing the window? --______.
A.Certainly not B.Yes,please C.Sorry,I won't 4 .-Excuse me.Where is the nearest post office? --Sorry,I'm
英语精选单选题易错题100题
英语精选单选题易错题100题
1 What do you think ______solve the problem ?
A you can do
B can you do
C you can do to
D can you do to
2 In the past he often made his sister____, but now he is often made ___by his sister.
A to cry; to cry
B cry; cry
C to cry; cry
D cry; to cry
3 The teacher told us that the sun ____in the east.
A rises
B rose
C raises
D raised
4 He lives in a village _____there are a lot of trees.
A there
B where
C that
D which
5 He _________ Alice for ten years.
A married to
B has married to
C has married
D has been married to
6 We need fifteen mo
精选备战中考物理易错题专题复习热学问题求解方法及答案解析
一、初中物理热学问题求解方法
1.戴眼镜的人从室外进入温暖的室内,镜片上会出现“水雾”,下列现象中的物态变化与“水雾”的形成相同的是()
A.饮料中的冰块逐渐变小
B.北方冬天植物上的雾淞
C.蒸锅上方生成的“白气”
D.寒冬,室外冰冻的衣服逐渐变干
【答案】C
【解析】
【分析】
【详解】
戴眼镜的人从室外进入温暖的室内,镜片上会出现“水雾”,这是眼镜温度较低,而室内水蒸气温度较高,水蒸气接触到眼镜时,会放出热量降温,液化成小水珠,附在眼镜上。A.饮料中的冰块逐渐变小,这是冰块吸热熔化成水,A项不合题意;
B.雾淞是由于空气中的水蒸气凝华形成的固态小冰晶,B项不合题意;
C.蒸锅上方生成的“白气”,这是水蒸气液化形成的小水珠,选项C符合题意;
D.寒冬,室外冰冻的衣服逐渐变干,这是衣服上的固态冰升华成水蒸气,D项不合题意。故选C。
2.受新型冠状病毒的影响,一“罩”难求。一般医用口罩至少要有三层,外层需要阻挡外界空气中的灰层、细菌、唾沫等飞溅物,中间层经过静电处理,可以阻挡细菌等微小颗粒(潮湿环境中会失去静电),内层要吸收佩戴者呼出的水汽、飞沫等。某口罩的构造如图所示。下列说法正确的是()
A.口罩潮湿后防护能力降低B.佩戴口罩时应该使白色吸水无纺布朝外C.口罩的中间层