乙醇氧化成乙醛的催化剂

一道应用题,用一元一次方程解一个水池装有甲,乙,丙三个进水管,单独开放甲管,45可注满全池.单独开放乙管,60可注满全池.单独开放丙管,90可注满全池,现在三管一齐开放,多长时间可注满全池 为什么北极只有北极熊而南极只有企鹅 为什么南极没有北极熊,北极没有企鹅 求一篇关于网络的作文,120词左右 请根据所给词组,写60~80词的作文.我们可以在网络上做什么.提示词汇；chat online ,send emails,do some shopping,learn English,watch movies,play computer games. 智利发生8.8级地震预计伤亡人数是多少?大概估计数字? 为什么玉树7.1级地震造成万余人伤亡,而智利8.8级地震伤亡人数并不大?北京时间2010年4月14日7时49分许,青海省玉树藏族自治州玉树县(北纬33.1,东经96.7)发生了7.1级地震,截至4月15日16时30分,玉树 黄海与东海、黄海与渤海的分界是什么 为什么南极不可以有北极熊?北极不可以有企鹅?== 开电子地球仪要上网吗?或要是非得上网的话,有没有不上网开电子地球仪的啊? 电子地球仪,打不开,见图 用 地球仪 自行车 电脑 编xie作文 咋写 有什么好看的13 26 39 集的动画片（要日本的） 39*43—13*26要简便计算 六大板块中,全部是海洋的板块是哪个 将下列句子排序,使其成为一段完整的对话 在括号里添数字 ( ) What`s the name of the book? ( ) Lucy,what can you see in the picture? ( ) Yes, it is. And a book is on the TV,too ( )Where is it?Is it on the TV? ( )Oh, sorry,I don`t 将下列句子进行排序,使之成为一段完整的对话.( )Well.I never eat fish for breakfast ,but I love to try new things.( )Sometimes we have salad,too .And we always have green tea.( )OK,My family have ajapanese style breakfast 给下列句子排序,使其成为一段完整的对话( ) No,it isn’t（ ）That’s all right（ ）Excuse me,where’s my ruler?Do you know?（ ）No,I can’t see it（ ）Is it in your math book（ ）Oh,sorry,I don’t know.Is it in your penc 英语作业不知对不对I've climbed mountains.I've had a drink.就是这个句子写的结构对么？ 亳州是哪个省的?亳这个字是发哪个音呀? 下大雪感受的文章(英文)(80词左右)（在线等） 我有点英语作业,有点麻烦谢谢了第一次主观作业1一． 英译汉1.The girl was frightened into crying when she saw the snake emerged from behind the tree.2.At last,the committee acted upon the suggestions the experts made.3.He seems 1.lily is ___ the airport to ___ mr.green.a.on see b.in get c.at meet d.to welcome 2.people in the country always have _____ food.a.nice b.good c.modern d.fresh 3.my friend will _____at the train station on saturday.a.see me off b.see off me c.see me 1 — Hi!How do you do,Zhang?— _______a How are you?b Good afternoon.c How do you do?d Very fine.2 — Jane,I’m coming to say good-bye.I’m leaving tomorrow.— _______a I’m sorry.b Oh,no.Why?c Go slowly.d Why soon?Can’t you stay a few days 英语作业 麻烦了谢谢 互联网好处多 作文70字 求达人给答案一、单选题1、We succeeded ________ all the difficulties.A.in spite ofB.becauseC.although2、This book is worth ________.A.to readB.of readingC.reading3、Learning English well isn’t easy ________ I like it very much.A.butB.a 求英语达人,大学英语作业一、单选题（共 15 道试题,共 45 分.）1.I have nothing ______ to say.A.in particularlyB.in specialC.in particularD.in specially满分：3 分2.By the end of last month,we _________ two bridges.A.have built 材料：量角器 直杆 线 尺子要求：测经纬度特别是求太阳高度的那部分我想要详细得求法。 天津泥人张的风格是什么? 将下列句子重新排序,组成一段完整,通顺的对话.Can I help you?Why not buy the gray trousers?Yes.please.I'd like a pair of trousers.All right.How do you like that pair?Just 380 yuan.It's not nice.I don't like it at all.They look very n 将下列句子重新排序,组成完整的对话