a4纸70克和80克对比

将五个阻值为20欧的电阻并联,其总电阻为多少欧? 两个阻值相同的电阻并联后的总电阻为20欧,则每个电阻的阻值为多少欧 小学英语单词,快冬天的铃声的英语单词,啥写? This is an English book (改为一般疑问句) 感兴趣的朋友帮我做几道初二英语阅读理解题BMa Lili’s parents are going to give a birthday party for her.She’s going to be fourteen years old.Ma Lili has a lot of friends.Ma Lili invited them to her home to take part in her birth 尊敬老人的你会做什么事情?原因是什么? this is my book 否定句? 怎么改啊有没有人啊 急死了 this is my English book.改为否定句 ____ ____ my Englithis is my English book.改为否定句____ ____ my English book. 想谈谈90后的人生理想! 青春感言 一句就可以 两只定值电阻R1标有“10欧,1安”,R2标有“15欧,0.6安”,求把他们串联起来用,两端允许的最大电压是多大?把他们并联起来用,干路电流允许通过多少安? 阻值为10欧的电阻R1和阻值为15欧的电阻R2串联总电阻是多少?若通过R1的电流为0.2 A,则通过电阻R2的电流是多少?R2电压是多少? 1欧和10欧的两个电阻并联,等效电阻为R1,阻值1欧,10欧,100欧的电阻并联,其等效电阻为R2.比较R1R2的大小.A.R1＞R2 B.R1＜R2 C.R1=R2 D.无法确定为社么选那个正确的? 谁有《中华题王》英语八年级上（配外研版）第二、三页答案、急!就是第二页Unit2 Please help me!到第三页综合应用的答案! AABB的词语 写快乐的 10个 阅读题 告诉我是从哪个句子里看出的 AABB式词语：画得-------；跳得--------；跑得---------；高兴得--------. AABB形式的四字描写开心的词语 初三英语上辅导书哪本好我学的是 人民教育出版社的 做题和辅导的 书 推荐在 书店能买到的 初三英语什么参考书比较好?我英语不太好..想问问要选什么参考书 hit sb in the head还是 hit sb on the head? 有什么区别? where your is Where is your school\home?什么意思 请帮我看看我写的英语句子有没有错误（初二）Vince said,"I am trying to sleep ,but I hear a man is singing loudly,So I can't sleep .Do you know who is he?"Hector said,"Oh,sorry this is me.""you sing very well.but would you mind not In Your Face的歌词是街头篮球里面的一首歌,只要歌词···Ann nobody can block meand nobody can stop me开头貌似是这个 you never know when you are going to get hit by the ball in your face in your face和on your face 的区别在脸上的意思in your face,但是IN是在什么.里面的意思,意思是在脸里?为什么不是用on aabb式的词语有哪些 25. I saw the man hit the boy _______ the face. 求AABB式的词语 It is the young man ____ looked for ____ caught the murderer.A.that,who B.that,they C.they,that D.they,which 麻烦问问是选择A麽?理由是什么? AABB式的词语有那些?