光的波长计算公式

1.某人上山的速度为每小时x千米,下山的速度为每小时y千米.如果上山和下山走的路长s千米,那么他来回共用多少小时? 一段山路长6千米,某人上山速度比下山慢三分之一,下山比上山少用1小时.求上山、下山速度分别是每小时几千米? “可是我害怕的糊涂了.”作者为什么害怕?结合文段简要回答.有一天,我在家听到打门,开门看见老王直僵僵地镶嵌在门框里.往常他坐在蹬三轮的座上,或抱着冰伛（yǔ）着身子进我家来,不显 I think they are interesting.改为一般疑问句 Mrs Green is often (stress) out 用括号内适当形式填空 Mrs.Green often _____ her children ____ _____ _____ after supper格林女士常在晚饭后太他的孩子去散步 英语翻译翻译：But his mother doesn't think they are good for his health My sister younger than me.=I am-----than my sister-----.同义句 But his mother does not think they are good for his health 的意思 用所给动词的正确形式填空Mrs green_(go)shooping every saturday Does she like dance? 英语翻译原文:太祖时,郭进为西山巡检,有告其阴通河东刘继元,将有异志者.太祖大怒,以其诬害忠臣,命缚其人予进,使自处置.进得而不杀,谓曰:“尔能为我取继元一城一寨,不止赎尔死,当请赏尔 〈宋〉欧阳修《归田录》——取信于人翻译 取信于人的翻译 帮忙翻译下 速度 急需On Friendship Everyone needs friendship. No one can sail the ocean of life single handed. We need help from, and also give help to, others. In the modern age, people attach more importance to relations and connections. 甲、乙两仓库共有粮食480千克,把甲仓库的粮食运给乙仓库30千克,甲仓库的粮食数量正好是乙仓库的3倍.求甲,乙两仓库原有粮食多少千克?（用综合式解答） my cookie can的意思,女生说的 my cookie can I found_ diffcult _with him.A.him,to get on B.it ,getting on C.that,to get on 选择那个快 i found it diffcult （get） to sleep at night括号里用什么形式? 已知平行四边形ABCD的面积为4,对角线的交点为O则△AOB的面积是= = 已知O为平行四四边形对角线的交点,且三角形AOB的面积为1,则平行四边形ABCD的面积为____说明原因 This is ____ orange.I don't like ____ colour.A.／,the B.an,／ C.an,a D.／,a homework有复数吗? homework的复数是什么?为什么? Housework homework有复数吗 homework分不分单复数. 一个超难数学题哦 2006减去它的2分之1,减去剩下的3分之1,减去剩下的4分之一,以此类推,只到减去剩下的2不好意思哦 2006减去它的2分之1，减去剩下的3分之1，减去剩下的4分之一，以此类推，只 解决压力的最好方式是什么? 压力大怎么办,有没有很好的办法解决?压力大,还烦恼 解除心理压力有几种方法? You have more interesting experiences than ____have.(my)应该填什么?为什么?