乙烯与溴的四氯化碳

张衡制作了什么? 张衡的创造 高中数学第21题第II小题不懂,盼您详细讲解分析, 您认为初中数学课程标准还可以做哪些调整?请简要说出您的建议. 张衡创作的抒情小赋是什么 红双喜这个字是由谁创造的? 请问红双喜这个字是由谁创造的? Jim is from London .He is ______.A EnglishmanB English boyC EnglandD English 梦到帮我同学做花圈我开始的时候去面试的,通过了.然后和我同学逛街,绕了一圈回到原地,她说她姐结婚,让我帮她做花圈送给她姐,说她们那边结婚都送花圈的,这个-_-||是什么意思啊,求赐教 求微分方程通解 香港城市大学怎么样 再请教英语高手一个句子结构.Her fingers aren’t steady,the line wavers,a bit of the handle enters the cup where the tea is and she looks up at him,smiles,looks down again,uses the eraser to rub away the offending curve.请问：为何这 请教英语句子结构的问题Since we last met in this chamber, combat forces of the the United States, Great Britain, Australia, Poland and other countries enforced the demands of the United Nations, ended the rule of Saddam Hussein, and the peo 已知方程求斜率假设ax+by+c=0 y=(-c/b)+(-a/b)x 所以k=(-a/b)例题中:y=2x+3 斜率为什么等于2 不是-2呢?完整例题:过点 0,1.与直线Y=2X+3平行的直线方程为?我想用点斜式 请教英语高手一个句子结构分析!I am not sure what the exact words were which he uttered from his mouth,but I understood what his meaning to be.其中我认为第一个what是状语从句,下面的which是表语从句,最后的what是宾 请解释第11,12,51小题 询问句子结构handsome is the masculine equivalent of -and refusal of- a compliment which has accumulated certain demeaning overtones,by being reserved for women only. 求分析句子结构Could you help me to figure out what expenses are when taking a trip abroad is like to a country in Europe? 2电子微粒有哪些? 为什么要在死人的灵堂里挂上一个"奠"字呢, 奠怎么组词 在平行四边形ABCD中,AC⊥AB,AC与BD交于点O,AO=1,AB=根号2.1）求BD长 2）求平行四边形ABCD周长和面积 问个句子结构As is known to us,man can't live without water.为什么不是As it is known to us,man can't live without water. 句子结构请教Mastering the flow of your work at all the levels you experience that work provides a much more holistic way to get things done,and feel good about it.请问这句话的主语倒底是什么,that work在句子中的作用是什么 请教句子结构With the acceleration of industrial growth came acute urban crowding and accompanying social stress.with ...came...accompanying ...什么关系啊 请教下句子结构The main function of the language-laboratory is to take over those aspects of the drill-work which are repetitive,mechanical,and do not absolutely require the presence of a live speaker,thus sparing the time and energy of this la 请教英语句子结构请问在这个英语句子中Experts estimate that ten times as much petroleum exists in such sources as tar sands,heavy oil,and perhaps even shale as in conventional reservoirs.主Experts ,谓estimate,that引导宾语从句, 初二三角形练习题直角三角形,AC垂直BC,垂足为C,AC=6cm,BC=8cm,AB=10cm,则点A到BC所在直线的距离是( )cm,点B到AC所在直线的距离是（ ）cm 关于英语的句子结构,想问问两个问题As I held him and assured him that he had done a terrific job and God was certainly not angry with him为什么从句那要用had done 而不用did?还有那些什么过去分词短语好像不要用Be 死了人为什么要摆花圈? 若多项式四分之一a的2次方+2ka+1是一个完全平方式,则k的值是多少?已知(x+y)^2-2(x+y)+1=0,则x+y的值为多少? (log4 3+log83)*(log32+log98)等于