纯化步骤中的分子筛柱层析的目的是什么

I may think it wrong这里为什么不用it's,而用it这是一道选择题I may think _______ wrong A it is B it C it has D was这道题的答案是B，我不知道是为什么 i saw you and her walking in the rain... 有一首歌,里面有一句歌词l saw you and her walking in the rain.这首歌的歌名是? 把下面大小相等的分数圈出来 hen ji a,da jia bang bang mang8×a分之5×a（a≠0）八分之五二十四分之二十10+m分之16+m四十分之二十五15÷11分之24÷11 bang bang mang利民商店经销某种洗衣粉,年销售总量为6000包,每包进价2.8元,销售价3.4元,全年分若干次进货,每次进货均为x包,已知每次进货运输劳务费为62.5元,全年保管费为1.5x元把该商店经销洗衣 bang bang mang a 世界上什么菜放多少盐都不咸?什么菜永远煮不熟?什么伤治不好?什么情忘不掉?什么痛好不了?什么人最难找?猜六个字连成一句话. 一道化学题 bang bang mang实验室用酒精灯给试管加热时,如果用内焰加热,试管外壁会附着一层黑色物质,实验证明该物质是炭黑,而用外焰加热时,却看不见这种现象.通过这个实验可以得出哪些结 they ned [ ] food this afternoon. who runs faster 英语翻译要全文 俄而贼数千没于蛰,城上鼓躁,突骑出乘之俘斩万计 文言文翻译 Mr Black worked __ into the night and finally he finished his workA deeply B lately C deep C latest rapid是双音节词,他的比较级是 rapider 还是 more rapidrapider 或 more rapid 都行?这是为什么啊 哪里有读商务英语的课程? （2+4+6+.+100)-(1+3+5+.+99) 上海哪里有业余读商务英语的课程? 谁知道昂刺鱼的生活环境?这鱼能否自己大量繁殖? "The greats of tomorrow are the least of today!" IMAGINE BEYONCé LIFE IS BUT A DREAM怎么样 美国国歌和的区别美国国歌是舒缓的,而苏萨的是进行曲,两者非常不一样啊为什么我一搜索美国国歌就变成星条旗的进行曲了? The workers must complete the house.改否定. --Which team won the game?--Oh,they____each order in the end,which was more than expected.A、heat B、won C、tied D、defeated(为什么答案选C,） OB英语What is stereotyping and why does it occur OB英语What is stereotyping and why does it occur The Emperor's New Clothes 歌词 it's a story a_______ 'the emperor's new clothes'首字母填空!一定要在今天回答!过期不算!拜…托… 概括the emperor's new clothes初二水平! it's called the Emperor's New clothes. 设G=有11个结点,m条边,证明G或者其补图G’是非平面图各位老大救命,谢谢大家 关于从句I really have no idea what these are supposed to mean?这个句子what 起什么作用,充当句子什么成分,没看懂!That's what we're all hoping .这个句子怎么分析? The____of the activity is peace and progressA.theme B.purpose C.importance D.spiritA B D 我觉得都翻译得过去啊,活动的主题,目的或者精神.但是不知道究竟改选哪个,还是我理解有误呢. 佳能最新广告歌曲成龙代言的那首歌叫什么?里面有歌词we are the champion的那首?