7埃克斯+4埃克斯=7.7怎么算

硼酸与乙醇反应(请高手指教)H3BO3+3C2H5OH==(浓H2SO4,点燃)==B(OC2H5)3+3H2O用于:A硼酸定性分析 B乙醇定性分析 C制造焰火 D硼酸定量分析 E乙醇定量分析 要说原因的 罗密欧与朱丽叶用英文怎么拼写? 硼酸在适当条件下与足量乙醇反应生成的硼酸酯的结构简式 解释下怎么写的 Peace comes from within.Do not seek it without的中文意思 硼酸中加如乙醇为什么酸性会增强硼酸是一元路易斯酸,为什么其酸性在加入乙醇等物质后酸性会明显增强,最好写出方程式 Happiness from your heart will last forever Happiness from your heart will last forever 哪里能买到简易乳化剂 If it______(not snow)in Suzhou next year,we will stay here to spend the holiday.正确答案应该是doesn't snow 请告诉原因.为什么不能用won't snow Next winter,( )you will spend in harbin ,I'm sure,will be another exciting holiday.A.which B.when C.in which D.what 让人人摸不着头脑,没有人能说出其中的道理是什么意思 求发送陈奕迅《welcome to the future》这首歌的MP3 我邮箱是missyf@sina.com Mr.Smith lived in a village.翻译 同义句转换mr and mrs smith lived in the countyside in the pastmr and mrs smith - - -in the countyside 吉安市有多少人口? 吉安市有几所小学 Many Chinese students go abroad （to further thier study）every year.括号部分提问（）（）many Chinese students go abroad every year?为什么用why 不用what in china ____graduates go to abored go have a furher study every year.A.a great deal of B.the number of C.many a D.a great many 为什么选D、?最好每个选择都分析 go to china study abroad To prepare whatI was born in Europe,now in Dubai Arabia tower,want to go to China where the best luxury to go abroad,deposit 20.900.000 euro,please tell me where to go,stay in that hotel,and that the school,Chinese will be a I have a wish to go to China.to go to China 是做定语还是同位语还是补语? 形容人 头脑清醒的四字词语. 形容思想起伏的四字词语虽然没有财富值,但是也能赚经验,帮助别人对自己也有好处,何乐而不为呢? What is your like wish in the future?怎么回答 The sun shines in < > the windows介词填空 what is your wish (in /for)2008? 介词填空：A river flows ( )the town 用适当的介词填空 Don't read _______ the sun 经济阈值的定义是什么?我是学药学的最近经常遇到什么经济阈值请问各位大哥它的准确 定义是什么(我手头没有经济学辞典) 阈值下限(15%) 中15%是指的什么? dtim阈值什么意思 阈值怎么读 1:He has lived in our town for two years(改为同义句)It( )two years( )he lived in our town2:She is (short) (对括号内部分提问)( ) ( ) she( ) ( ) 3:It's very nice of you to meet me at the airport(改为同义句)You are so ( ) ( ) meet me a 英语翻译It（ ）two years （ )he lived in our town填空,