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志同道合是什么意思 高炉炼铁用赤铁矿作原料,若要练出1120吨含铁95%的生铁,需要含氧化铁80%的赤铁矿多少吨? Na2CO3.NaOH.NaSO4.BaCL2.KCL.CuCL2.和HCL等溶液当他们两两混合时,生成Nacl的方法有几种 为什么煤气炉的火经常会突然灭掉?我家的是双炉头一个会灭,另一个不会灭 股票中道指是什么意思 道指的是什么?德指的是什么? 合金为什么熔点低、要从结构角度解释、 凝华和升华今天刚学,听了几句就晕了.究竟如何判断升华.凝华呢?书上的概念是固体变气体?就升华,凝华怎么判断呢?雾——液体 霜——固体 水蒸气——气体大雾是液体?我主要是做题就满头金 木炭粉、一氧化碳分别还原相同质量的氧化铜,则所需木炭粉、一氧化碳二者的质量比C+2CuO=2Cu+CO212 160CO+CuO=Cu+CO228 80x=56 16012:56=3:14不是3：7 可是x=56是怎么来的啊 1、In spite of their insults ,I ( ) my temperlA) tried keeping B)controlled to keep C)managed to keep D)allowed to keep2、After sailing for an hour ,we ( ) a beach.A) arrived in B) reached to C) got down D) landed at 3、He is known ( ) “Long Tom Madium ,was - all doubt the best scientist in her day ,won two Noble Prize.A without .B beyond .C among .D with 几道英语选择题,请各位大侠们帮我解答一下为什么,I am amazed _______ this little village is a paradise to live inA.that you would think B.tha you should thinkC.by what you are thinking D.with waht you are thinkin 1.Please call me______ 870-4458.A:in B:of C:at 2.There is a set of______ on the desk.A:key B:keies C:keys 3._______ are good friends.A:Jim and I B:Me and Jim C:Jim and me D:I and Jim 4.Is your notebook______ the lost and found case A:in B:at C:to D:o 羟基醛基羧基可以通过氧化还原自由转换吗羟基=》醛基 醛基=》羟基 醛基=》羧基羧基=》醛基氧化还原的方法 一氧化碳还原氧化铜试验中为什么要先通气再加热?那么如果先加热再通气会有什么后果？ 铁和稀hcl反应的化学方程式急 Fe与HCl反映的化学方程式 Fe Al Mg与O2、HCL反应的化学方程式 KAlO2与HCl反应化学方程式· 判断下列反应是否能发生,如果能,写出化学方程式.Mg(OH)2+HCL Stand ( ) so that the picture to be taken will be clear.A.still B.calm C.yet D.even最好还能有中文翻译. 分析化学 红外光谱CH3-O-CO-CH=CH2和CH3-CO-O-CH=CH2的羰基伸缩振动分别是1715和1760,为什么 （） Which of the magazines will you take?I’ll take ______,one for myself,the others for my students.A.none B.neither C.all D.both一直在C与D中徘徊，请说明选C或D的理由。另外 问句中的Which是否代表只有2本杂志，我也 试比较以下化合物,羰基伸缩振动的红外吸收波数最大者是哪个?为什么? 各位大侠：请教一道英语选择题.急!非常感谢!His gift______ revealing teh mysteries of the universe.A. of B. for可否给出解释或例句。为什么？怎么几个网友的答案都不一样呢？ 在萨特勒红外光谱图中收集苯甲醛、苯乙酮、苯甲酸甲酯和苯甲酰胺的红外光谱图,记录其中羰基的振动频率.在萨特勒红外光谱图中收集苯甲醛、苯乙酮、苯甲酸甲酯和苯甲酰胺的红外光谱 红外光谱中羰基和酯基的峰各是在哪里出峰? 4.One Sunday,Mark decided to go sailing in his boat with his friend Dan,but Dan happened to be away.Dan''s brother John offered to go instead though he did not know anything about sailing.Mark agreed and they set out to sea.Soon they found themselves Robert is nine years old and Joanna is seven.They live at Mount Ebenezer.Their father has a big property.In Australia they call a farm a property.Robert and Joanna like school very much.At school they can talk to their friends,but Robert and Joanna c 英语阅读理解(选择题)Many years ago,three lived a doctor in a small town.He was good and kind.Everyone in the town( 1 )him and people always went to him when three was something wrong( 2 )them.But later,as the doctor became old,he had a bad m The book The Origin of Species by Charles Darwin is probably one of the most famous books ever written by a scientist.Yet it is a book which the writer did not want to publish; he only agreed to make his theory known to the public when he was forced 经常梦到以前的男朋友是怎么回事好像是只要白天我想了晚上就会梦到,昨天晚上我感觉自己说梦话说到他了 已经分手2年多了 没有梦到以前发生的事,就是梦见他这个人 很郁闷 这样的情况能