(1)由表格中的数据可知:金的导电性能比较差,价格又贵,不适合做导线;银和铜的导电性能较好,但银的价格比铜的价格高的多,铜和铝相比,价格差不多,但铝的导电性能较差,钢铁和铅导电性能更差,故学生实验用细导线比较合适是铜导线; (2)由于高压线比较粗,体积大,除考虑导线的导电性能和价格外,还要考虑导线的重力,若重力过大,架线比较困难,所以还要求导线的密度要小,这样同体积的情况下,质量就小,重力就小,因为铝的密度比较小,导电性能也不是很差,价格也不是很贵,所以高压输电线一般用铝制成. 故答案为:铜;导电性能较强,密度较小,价格较便宜. |
学生适合做什么样的美甲(三):
书面表达 作为一名学生,你认为什么样的校规比较合适,下面是你和同学讨论的结果.请你用英语向同学汇报
1.校规允许做的事:应该允许交朋友,以便交流;允许自己设计校服,使自己更有朝气;可以做一些志愿工作,增长社会经历.
2.校规不允许做的事:不允许上课迟到,不允许戴耳环,打耳洞;不允许在校园内骑车,这很危险.
Every school has rules for students.As a student,we must obey them.______________________________________________________________________________________________________________________________________________________【学生适合做什么样的美甲】
We think we should be allowed to make friends to communicate with other students.We should be allowed to design the school uniform by ourselves.What"s more,we should also be allowed to do some volunteer work to increase social experience.
There are also some things that we can"t do according to the school rules.For example,we are not allowed to be late for class,to wear earrings or ear hole,to ride a bike on campus,which is very dangerous.【学生适合做什么样的美甲】
学生适合做什么样的美甲(四):
配对阅读。左栏是对5个学生做演讲时存在问题的描述,请在右栏为每个学生选择一个合适的建议,并将答题卡上对应题目所选的选项涂黑。
小题1:Paul: I don’t think I can talk fluently(流利) because it’s difficult for me to remember all the words. 小题2:Billy: When I come face to face with the audience, where should my eyes fall upon? Do I have to look front, or look around from time to time? 小题3:Amy: When I am talking, I can’t help waving my hands, for I think it can help me express what I want to say better. But my classmates say I look funny and foolish by doing this. 小题4:Betty: I know that it’s not right to speak fast. But I am afraid that I can’t finish my talk in the given time if I speak slowly. 小题5:Tony: Should I talk in American English or British English?
| A.Looking at and talking to one person in the audience helps keep you natural, but it feels foolish talking to only one person. Speak to that person as long as 15 seconds and then change another one. | B.The audience have a hard time understanding what they hear. They need your help. Slow down, pause(停顿) and guide the audience through your talk. Remember that you should help the audience understand what you are saying. | C.Make your voice a little lower than normal. Listeners like to listen to a relatively(相对) deep voice. | D.When you talk, try to be as natural as possible. Don’t try to memorize your words and read or recite them to your audience. You can use short notes to help you remember the important points. | E. You should know you and most of the people you talk to are different in many ways. Some of them may not know what you are talking about. Then speak to them on their terms and in their languages. F. Concentrate on what you want to say. If you are always paying attention to gestures(手势),you will feel uncomfortable. G. It’s true that there are some differences between American English and British English, but they’ll not cause much difficulty for listeners, so just speak the way you’re used to.
| |
小题1:D 小题2:A 小题3:F 小题4:B 小题5:G |
要仔细审核试题的要求,仔细阅读文章内容,选择适当的答案。 |
学生适合做什么样的美甲(五):
适合六年级学生做的分数、小数、百分数、整数的数学简便运算
这个寒假数学老师布置每人一天一道计算题,可真不知道该出些什么,
1125-997 998+1246+9989 (8700+870+87)÷87
125×8.8 1.3+4.25+3.7+3.75 17.15-(3.5-2.85)
3.4×99+3.4 4.8×1.01 0.4×(2.5÷73)
(1.6+1.6+1.6+1.6)×25 ( + - )÷
12.3-2.45-5.7-4.55 2 + 0.125×0.25×64
64.2×87+0.642×1300 78×36+7.8×741-7 17+ 8
0.125× +0.5 2.42 +4.58 -43
25÷100 4.25-3 -(2 -1 )
(1)1.25*17.6+36.1/0.8+2.36*12.5
1.25*17.6+36.1/0.8+2.36*12.5
=(5/4)*17.6+36.1*(5/4)+23.6*(50/4)
=176/8+361/8+236/8
=773/8=96.625
(2)7.5*2.3+1.9*2.5
7.5*2.3+1.9*2.5
=7.5*(1.9+0.4)+1.9*2.5
=(7.5+2.5)*1.9+7.5*0.4
=19+3 =22
(3)2004/2003*2005
2004/2003*2005
=(2004/2003)*(2003+2)
=2004+4008/2003
(4)276*543-267/276+543*275
276*543-267/276+543*275
=543*(276+275)-267/276
=543*551-267/276
(5)17/51+ (68/1+51/2)*17
17/51+ (68/1+51/2)*17
后面的做不下去了,好像有一些没有简便方法,不知道你题目有没有抄错,你的68/1中的68是分子还是分母呀?应该是分母都对
(6)(3.25-0.8*8/5)/(6又4/1-3.5)
是6又1分之4吗?应该是6又4分之1吧
1)五十二又二十五分之十一×79.45+159×47.56+七十九又二十分之十一×52.44
=52.44×79.45+159×47.56+79.55×52.44
=52.44×(79.45+79.55)+159×47.56
=52.44×159+159×47.56
=159×(52.44+47.56)
=159×100
=15900
3)2002+2001-2000-1999+1998+1997-1996-1995+……+2+1
=(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+……+(6-4)+(5-3)+2+1
=2+2+2+2+……+2+2(从3-2002共2000个数,所以有1000个2)+2+1
=1000×2+2+1
=2003
4,5两题均用到一个转换式1/(A×B)=1/(B-A)×(1/A-1/B)
如1/15=1/(3×5)=1/(5-3)×(1/3-1/5)=1/2×(2/15)=1/15可验证一下
4)(1×2分之一)+(2×3分之一)+(3×4分之一)+……+(10×11分之一)
=1/(1×2)+1/(2×3)+1/(3×4)+……+1/(10×11)
=(1-1/2)+(1/2 - 1/3)+(1/3 - 1/4)+……+(1/10 - 1/11)
=1-1/11
=10/11
5)三分之一+十五分之一+三十五分之一+六十三分之一+九十九分之一
=1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+1/(9×11)
=1/2×(1-1/3)+1/2×(1/3-1/5)+1/2×(1/5-1/7)+1/2×(1/7-1/9)+1/2×(1/9-1/11)
=1/2×(1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + 1/9 - 1/11)
=1/2×(1-1/11)
=1/2×10/11
=5/11
6)一又二分之一-六分之五+十二分之七-二十分之九+三十分之十一-四十二分之十三+五十六分之十五
(根据提示,1又1/2=1+1/2,+1/2+1/3=5/6……)
=(1+1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1+ 1/2 - 1/2 - 1/3 + 1/3 + 1/4 - 1/4 - 1/5 + 1/5 + 1/6 - 1/6 - 1/7 + 1/7 + 1/8
=1+1/8
=9/8
1. 3/7 × 49/9 - 4/3
2. 8/9 × 15/36 + 1/27
3. 12× 5/6 – 2/9 ×3
4. 8× 5/4 + 1/4
5. 6÷ 3/8 – 3/8 ÷6
6. 4/7 × 5/9 + 3/7 × 5/9
7. 5/2 -( 3/2 + 4/5 )
8. 7/8 + ( 1/8 + 1/9 )
9. 9 × 5/6 + 5/6
10. 3/4 × 8/9 - 1/3
11. 7 × 5/49 + 3/14
12. 6 ×( 1/2 + 2/3 )
13. 8 × 4/5 + 8 × 11/5
14. 31 × 5/6 – 5/6
15. 9/7 - ( 2/7 – 10/21 )
16. 5/9 × 18 – 14 × 2/7
17. 4/5 × 25/16 + 2/3 × 3/4
18. 14 × 8/7 – 5/6 × 12/15
19. 17/32 – 3/4 × 9/24
20. 3 × 2/9 + 1/3
21. 5/7 × 3/25 + 3/7
22. 3/14 ×× 2/3 + 1/6
23. 1/5 × 2/3 + 5/6
24. 9/22 + 1/11 ÷ 1/2
25. 5/3 × 11/5 + 4/3
26. 45 × 2/3 + 1/3 × 15
27. 7/19 + 12/19 × 5/6
28. 1/4 + 3/4 ÷ 2/3
29. 8/7 × 21/16 + 1/2
30. 101 × 1/5 – 1/5 × 21
31.50+160÷40 (58+370)÷(64-45)
32.120-144÷18+35
33.347+45×2-4160÷52
34(58+37)÷(64-9×5)
35.95÷(64-45)
36.178-145÷5×6+42 420+580-64×21÷28
37.812-700÷(9+31×11) (136+64)×(65-345÷23)
38.85+14×(14+208÷26)
39.(284+16)×(512-8208÷18)
40.120-36×4÷18+35
41.(58+37)÷(64-9×5)
42.(6.8-6.8×0.55)÷8.5
43.0.12× 4.8÷0.12×4.8
44.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6
45.6-1.6÷4= 5.38+7.85-5.37=
46.7.2÷0.8-1.2×5= 6-1.19×3-0.43=
47.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9
48.10.15-10.75×0.4-5.7
49.5.8×(3.87-0.13)+4.2×3.74
50.32.52-(6+9.728÷3.2)×2.5
51.[(7.1-5.6)×0.9-1.15] ÷2.5
52.5.4÷[2.6×(3.7-2.9)+0.62]
53.12×6÷(12-7.2)-6 (4)12×6÷7.2-6
学生适合做什么样的美甲(六):
简单的、适合小学生做的科学实验.可以说怎么做,要结论.也可以直接一个实验来——(每个人回答后会有让你做得更好的小寄语,可以的话追加分数)
我心依旧.请您再多加几个问题好吗?
GeeFans...请您再显示一点什么好吗?比如说:网址、一些内容等等
你们回答的都很好哟!
带电的报纸
思考:不用胶水、胶布等粘合的东西,报纸就能贴在墙上掉不下来.你知道这是
为什么吗?
材料:1支铅笔;1张报纸.
步骤:
1. 展开报纸,把报纸平铺在墙上.
2. 用铅笔的侧面迅速地在报纸上摩擦几下后,报纸就像粘在墙上一样掉不下来
了.
3. 掀起报纸的一角,然后松手,被掀起的角会被墙壁吸回去.
4. 把报纸慢慢地从墙上揭下来,注意倾听静电的声音.
说明:
1. 摩擦铅笔,使报纸带电.
2. 带电的报纸被吸到了墙.
可以吗?
学生适合做什么样的美甲(七):
《我想做个________的小孩》这个题目里,括号里能填什么?《我给_____颁个奖》这个题目,横线上能填什么
适合五年级学生写的.
《我想做个强壮的小孩》《我想做个隐形的小孩》《我想做个会飞的小孩》《我想做个天真的小孩》《我想做个聪明的小孩》《我想做个美丽的小孩》……这个可以根据你自己的性格或外型特点相反的去写哦,也可以写一些科幻一些的.
《我给妈妈(爸爸)颁个奖》《我给天空(大海、大山)颁个奖》《我给蜜蜂颁个奖》《我给青菜颁个奖》《我给书籍颁个奖》《我给文具颁个奖》……想想看生活中有什么东西什么人帮助了你,或者对别人有好处的东西或人,就可以颁奖,蜜蜂很好写,因为蜜蜂很勤劳呀,这些我们以前都学过的.不过关是什么,有优点的就可以颁奖.
祝您学业进步!快高长大!
采纳我吧,我也想了很久的哦,谢谢!
学生适合做什么样的美甲(八):
一个学生物理学得好可他数学不行,这说明他的哪方面在行?(下有补充请详细阅读)
空间能力、想象能力、几何能力、还是推理能力?他做什么工作合适?
动手操作能力一般,小时候做简易的灯光插座电路还弄了很久
物理学得好而数学不行,这太少见了,我没见过.数学好,物理不好的却很多.
学生适合做什么样的美甲(九):
求10条关于保护环境我们能做的.要英文!
不要太长 适合中学生的
what can we do to help protect the environment?
we can plant trees and flowers,use paperbags,protect animals,make the fullest use of water,smoke less,reduced driving private cars,stop pouring waste water,use a handkerchief,save water
学生适合做什么样的美甲(十):
适合初中生来做.禁用方程!代数不是小学生该用的.用奥术法!
.有一段路共长230千米.某车去时共用4.5小时,返回共用4.45小时,已知平路速度为每小时60千米,上坡路速度为每小时40千米,下坡路速度为每小时50千米,求这段路中平路,上坡路,下坡路各多长?
代数法不采纳.
是的.
去时比返回多用4.5-4.45=0.05小时,说明去时的上坡比下坡长一些.
去时的上坡比下坡长:0.05/(1/40-1/50)=10千米.
若上坡和下坡一样长,则去时用时为4.5-10*1/40=4.25小时
此时上下坡平均速度为2/(1/40+1/50)=400/9千米.
以下用鸡兔同笼思考:
(220/ 400/9-4.25)/(9/400-1/60)=120千米(平路)
下坡是:(220-120)/2=50千米
上坡:50+10=60千米.
学生适合做什么样的美甲
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推荐访问:适合学生的美甲图片
适合上班族做的美甲