分类
日常

最近物理有点混乱

最近物理电磁学那块受力判断有点混乱。

比如说

我居然用“左手定则”判断出电流方向从A到B。

其实左力右电,应该是用右手定则。

还有一个混乱的东西,我把导体和运动电荷的受力混起来了。

比方说上面那道题,我会用左手定则判断出安培力沿杆方向向下…….(昨天做去年高考卷就因为这里浪费了很多时间)

其实导体棒的是跟电流方向、B垂直。运动电荷才是和运动方向、磁场方向垂直。

所以总结了一下有两个混乱点:

1.几乎忘记了用右手定则判断导体棒切割磁场时的电流方向。

2.把运动电荷(洛伦兹力)和导体棒切割磁场时(安培力)的左手定则搞混了。

分类
日常

为什么我会一直以为浓硫酸会和二氧化硫反应?

真是奇怪,我为什么始终以为浓硫酸可以而二氧化硫反应生成硫?

它们不是相邻价态吗?

看来有时候思维一当形成了,即使是错误的也会不自觉地运用。

分类
日常

英语作文句型

Never Below 20 Again


建议类

1.There is every reason to do

2.From my standpoint/perspective/view

3.You ought to spare no effort to do sth、go all out to do(全力以赴做某事)

4.be supposed、ought to、What is necessary for you to do is 不要老是You should

5.My suggestions are as follows.(引出下文建议,结构清晰明了)

6.Hope what I advice will be helpful to you.

7.We cannot emphasise something too much.

8.If you have something else to ask,do not hesitate to contact me.

9.Under the circumstances,you will……

10.it will be of great significance to do sth

11.It will be a pleasure for me if the tips above can do you a favor.

12.It not sth but sth matters(对方求助是对某两件事感到困惑时)

13.I will be more than happy my advice above can do you a favor.

14.is well be a better alternative for us to do something

15.Given that……在……的情况下


邀请类

1.


求助类

1.Could you please do me a favor?

2.I am stuck at a stage where I can hardly make any progress in my English,for exmaple it is difficult for me to memory words.What’s worse,my listening is poor……

3.

 


介绍类

1.our school arranges such activity in hope of that it can broden our horizons and enrich our after class lives.

2.Our class has …… concerning water saving……


其它类


英语作文连接短语

1.表文章结构顺序:First of all,Firstly/First,Secondly/Second… And then,Finally,In the end,At last

2.表并列补充关系:What is more,Besides,Moreover,Furthermore,In addition As well as,not only…but (also), including,

3.表转折对比关系:However,On the contrary,but,Although+clause(从句), In spite of+n/doing,On the one hand…,On the other hand… Some…,while others…,as for, so…that… 4.表 因 果 关 系:Because,As,So,Thus,Therefore,As a result 5.表换一种方式表达:In other words,that is to say,

6.表进行举例说明:For example;For instance;such as+n/doing 7.表 陈 述 事 实:In fact,frankly speaking,

8.表达自己观点:As far as I know/concerned,In my opinion,personally, as to me

9.表总结:In short,In a word,In conclusion,In summary,all in all, briefly/ in brief ; generally speaking, as you know, as is known to all

分类
日常

数学好题易错题

选A的原因是因为忽略了0的两个关于直线的对称点-2和2。

没有-2的对称点-4是因为区间开闭不同。

分类
日常

英语作文连接词

考纲中英语一类作文有一点:有效地使用了语句间的连接成分,使全文结构紧凑。


(1)表示承接的过渡词:also,and,and then,too,in addition,furthermore,moreover,what’s more, again,on top of that(除此之外),another,first,second,third等。 (2)表示时间顺序的过渡词:now,then,before,after,afterwards,earlier,later,immediately,soon,next,in a few days,gradually,suddenly,finally··等。(但是你可以感受到这些词是副词,所以原词条对于“连接词”即连词是错误的) (3)表示空间顺序的过渡词:near(to),far(from),in front of,behind,beside,beyond,above,below,to the right/left,around,outside等。 (4)表示比较的过渡词:in the same way,just like,just as等。 (5)表示转折的过渡词:but,still,yet,however,nevertheless,nonetheless,on the contrary,in spite of/ in spite of the fact that,even though,although,despite / despite the fact that等。 (6)一方面,另一方面:on the one hand,on the other hand,for one thing,for another等。 (7)表示结果和原因的过渡词:because,since,so,as a result,therefore,then,furthermore,otherwise等。(as a result ,therefore, thus并不是连词而是介词,尤其是thus,虽然有连词的用法,但是不常用) (8)表示目的的过渡词:for this reason,for this purpose,so that等。 (9)表示强调的过渡词:in fact,indeed,surely,necessarily,certainly,without any doubt,truly,to repeat,above all,most important等。 (10)表示解释说明的过渡词:for example,in fact,in this case,for actually, for instance等。 (11)表示总结的过渡词:in a word,above all,,all in all,finally,at last,in conclusion,as I have shown,in another word,in brief,in short,in general,on the whole,as has been stated,last but not least等。

分类
日常

数学好题

这道题很难,考查的内容很多。

首先要这样观察,E,B,C共线而E又是中点,所以可以把AE用很确切的AB,AC表示出来(这里是二分一)。然后因为AD与AB关系已知,可以在ADC里做文章,即设AF=xAE,然后再把AB换成AD然后再利用共线等于1求出x再带回去,然后再把AB,AC换成AQ,AP,再利用共线等于一再乘一法。

分类
日常

英语作文句型

Never Below 20 Again


建议类

1.There is every reason to do

2.From my standpoint/perspective/view

3.You ought to spare no effort to do sth、go all out to do(全力以赴做某事)

4.be supposed、ought to、What is necessary for you to do is 不要老是You should

5.My suggestions are as follows.(引出下文建议,结构清晰明了)

6.Hope what I advice will be helpful to you.

7.We cannot emphasise something too much.

8.If you have something else to ask,do not hesitate to contact me.

9.Under the circumstances,you will……

10.it will be of great significance to do sth

11.It will be a pleasure for me if the tips above can do you a favor.

12.It not sth but sth matters(对方求助是对某两件事感到困惑时)

13.I will be more than happy my advice above can do you a favor.

14.is well be a better alternative for us to do something

15.Given that……在……的情况下


邀请类

1.


求助类

1.Could you please do me a favor?

2.I am stuck at a stage where I can hardly make any progress in my English,for exmaple it is difficult for me to memory words.What’s worse,my listening is poor……

3.

 


介绍类

1.our school arranges such activity in hope of that it can broden our horizons and enrich our after class lives.

2.Our class has …… concerning water saving……


其它类


英语作文连接短语

1.表文章结构顺序:First of all,Firstly/First,Secondly/Second… And then,Finally,In the end,At last

2.表并列补充关系:What is more,Besides,Moreover,Furthermore,In addition As well as,not only…but (also), including,

3.表转折对比关系:However,On the contrary,but,Although+clause(从句), In spite of+n/doing,On the one hand…,On the other hand… Some…,while others…,as for, so…that… 4.表 因 果 关 系:Because,As,So,Thus,Therefore,As a result 5.表换一种方式表达:In other words,that is to say,

6.表进行举例说明:For example;For instance;such as+n/doing 7.表 陈 述 事 实:In fact,frankly speaking,

8.表达自己观点:As far as I know/concerned,In my opinion,personally, as to me

9.表总结:In short,In a word,In conclusion,In summary,all in all, briefly/ in brief ; generally speaking, as you know, as is known to all

分类
日常

理综选择题拉练记录

拉练时间:2017年3月15日――2017年3月25日

分类
日常

生态学工程的五个原理

分别是物质循环再生原理(无废弃物农业)、物种多样性原理(三北防护林、珊瑚礁区)、协调与平衡原理(水葫芦泛滥)、整体性原理(自然经济社会)、系统学和工程学原理(桑基鱼塘)。

分类
日常

重启理综军事演习

昨天在学校简直是溃败。希望今晚的理综军演能有所进步吧。

这回尝试更换做题顺序如下:

1.生物全科

2.化学全科

3.物理全科

目标是:确保优势得分 力争劣势抢分