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偏微分方程求解. 求过点P（1,3）,并且与直线x＋2y－1＝0垂直的直线方程 过点p(1,1)且和直线x-2y 3=0垂直的直线方程 求过点P(-1,3)且与直线x+2y-3=0垂直的直线方程为 请问There is much truth in the idea that kindness is usually served by frankness. 怎么用差分法求解偏微分方程? 英语文章改错,谢谢,急,明天就考试了.谢谢Economic development and environmental protection are apressing issue primarily for developing countries where, in trying to catch upwith developed countries, they have to consume natural resourc 若关于x的方程ax-1分之x-a的解是x=2,则a= 1My birthday is on the 18of april2I usuallyhas a birthday party3Does Ben and his brother like cartoons?4They are talk about their present. 英语改错, 英语翻译Lemongrass leaves were ground through a knife grinder (Model MA 580,Marconi,Brazil),and about 300 g were loaded in the extractor. 英语翻译The rate of scientific progress in now so rapid that there are always new developments that have occurred since one was at school or university. 英语翻译“In general,robot control architectures can be defined as deliberative,reactive or hybrid“ 关于x的方程 x^2+ax+a-1=0的根的情况为? 英语翻译Because the prevalence figures yielded by retrospective surveys are so much a function of how abuse and childhood are defined,the precise statistics are of less interest than the fact that even the most conse rvative estimates show that s 关于x的方程（ax-b）∧2=ax-b（a≠0）的根是 各位大侠,帮忙翻译一句话老虎乃林中之王,穿虎头鞋既能避邪又能保佑宝宝吉祥如意,平平安安. 初中用什么笔袋?用什么笔?读什么书? 英语翻译1.2.0MM thickness aluminum alloy inner pot with non-stick coating for easy cleaning,and durable with clear scale line.2.4in 1 functions for cooking,steaming,keeping warm & porridge cooking,easy operating and use conveniently.3.Dual heatin 英语翻译Enjoy!chocolate is good for your heartit's true:a new study from BMJ.com finds that eating chocolate is no sin.In fact,it was associated with a 37% lower risk of developing heart disease.Heart disease is the leading cause of death in the How did you get home _ school?A.to B.How did you get home _ school?A.to B.from Q for D.at 大学英语精读第四册课文deer and the energy cycle翻译 麋鹿王 THE KING OF MILU DEER怎么样 英语翻译 BEC答题时间紧麽中级,我指的是reading return of the mack歌词翻译 没有时间去上一般的商务英语补习班怎么办呢? 商务英语补习班有多少?学英语困难不?各位朋友都踊跃的参与一下,捧捧场. 天津商务英语补习班,想利用业余时间提升一下? 1、红线的不知怎么化的和?2、不是还能化为ln【（x+开根号x^2-a^2）的绝对值】的形式的吗?不知这样做是否也可以?打错字了，问题1说的是：红线的不知道是怎么化的。 关于定积分计算问题.红线部分求解的不是很明白.为什么就得出红线部分的等式. 英语翻译Human resource management mode:based on work and quality of research In modern times,the human resources of the enterprise is the first resource and the most important factor of production idea more and more get enterprise's approval.Howe