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有关于被子植物双受精(承诺50追加)（大孢子母细胞） 减数分裂 有丝分裂 雌蕊：胚珠中胚囊母细胞(2N)————→大孢子—————→胚囊（N）[卵细胞（1个）、助细胞（2个）（退化消失） 甲乙两车分别从AB两地同时出发,相向而行.甲车每小时行40千米.当两车在途中相遇时,甲乙两车所行的路程比是8:7.相遇后,两车立即返回各自的出发地,这时甲车吧速度提高了25%,乙车速度不变.当 甲乙两辆车从AB两地同时出发,相向而行,甲速40千米／时.两车在途中相遇时,甲行的路程与乙行的路程比是8：7.相遇后,两车立即返回各自的出发点,这时甲速提高25%,乙速不变.甲车返回A地时,乙 英语高手们,帮我看看我的语法对不对1、一些建筑师对他们的职业有种不负责任的态度,我翻译成：Some architect have a attitude of irresponsibility to their career.2、这条路一个月前刚竣工,但是一个月后, 请问下面的句子可以单独用吗?in my heart i feel you are all my brothers 可以单独用吗? 1.handsome(adj.) May told me that Peter was handsome when he was eight years old.2.fit(adj.) May told me that Peter was fit when he was eight years old.3.various(adj.) My mother bought various handbag and clothes last summer holiday.4.traditional(adj 英语高手们,帮我看看这句话的语法对不对?However,to my mind,what these catastrophes bring to us are not merely great losses and grief,but,what’s more,reconsideration about our beliefs and behavior towards Mother Nature when we satisf 这句英文语法帮看下这样对不对?He want to go abroad,but it was impossible可以改这样麼He want to go abroad,and this was impossible.语法上有什麼差别会的帮解答下xie xie 甲乙两车同时从AB两地相向而行,甲车每小时行50千米,乙车每小时行48千米,它们在离AB两地中点8千米处相遇AB两地的距离是多少千米? 甲乙两车AB两地相向而行甲行完AB全程要6小时甲速：乙速快50%相遇甲行：乙多行180KM相遇路程的比是多少? 甲乙两车AB两地相向而行甲行完AB全程要6小时甲速：乙速快50%相遇甲行：乙多行180KM乙车每小时行全程（/） 将函数f(x)=1/x平方-5x+6展开为x的幂级数 将函数f(x)=x/(x^2-5x-6)展成x的幂级数 甲乙两车AB两地相向而行甲行完AB全程要6小时甲速：乙速快50%相遇甲行：乙多行180KM乙每小时行多少千米? 将函数f(x)=1/x^2-5x+6展开成x-1的幂级数 一个太阳,一个小树苗,一个三数字,一个月亮,请问这个是什么成语? 我和爸爸 作文600-/800字最好是写一件事，当然，如果没有 我和爸爸的作文，也可以我和某某。 一个太阳一个月亮什么成语 帮我看看下面这片短文的语法有没有错误,英语大师帮帮我看看Dear grandparents,NOV 27th 2009First,warm wishes at Thanksgiving.I'm sorry that I didn't say "thank you" yesterday.I was so busy yesterday.And I wish it won't be late.w 语法语法问题 英语 语法 专家来看下 1.The journey out of Iraq could be the most dangerous one they make there.这句话中的they make there是什么成分?省略了什么?为什么省略?2.Once on the Iraq highways,the soldiers are the 请英语大师看看这句有语法问题吗?look forward to thefollowing his future career and achievements一个美帝人翻的,.. 英语大师来看拿下 1.She got off the bus,burdened with 2 heavy suitcases.这句话中的burdened with 2 heavy suitcases是什么结构做什么成分?2.A:Maybe you should give me some lessons in that.B:I wouldn't persume.B的回答中的为什 描写月亮和月光的成语有哪些 描写月亮成语 英文申请信,帮忙检查错误(语法和格式)Dear sir or madam,I am a student from China and I During my undergraduate studies,I have studied such subjects as calculus,linear algebra,probability theory,statistics,microeconomics,macroeconomics,p 帮我检查下我写的英文有没有语法问题.My major is industrial design.After three months of study.I more and more like this major.Because what the industrial designers do is to improve People's lives and to help people in need.This is wha 帮忙看下有没有语法问题给改一下,英语Is a kind of psychological phenomenon that teen-agers often say something about opinionated words or do something about opinionated deeds.是一种青春期的少年经常说些过于自以为是等 英语翻译Although I am busy I won't give up music either. 英语语法专家 下面三个问题 帮忙看一下 谢谢1.The People's Courts maintain order in the market economy, crack down on embezzlement and briber, punish corruption, handle civil, economic and administrative cases, balance economic relati 1.How long have you been here?A.stood B.to standC.standing D.stands2.The student has been the novel since he finished school.A.wrote B.writingC.written D.writes3.— Hi,David!Are you tired?— Yes,I am tired.I the classrooms for 4 hours.A.am cleaning 英语 语法是否错误?She has signed up for english language training courses,the cost of which is much more than her annual income这不是两个句子吗?为什么逗号直接连接两个句子 1、已知A={x|x的2次方＋x－6=0},B={x|mx+1=0}.且A∪B=A,求m的取值.2、设p：关于x的不等式a的x平方>1(a>0且a不等于1)的解集是｛x|x0时,f(x)>0,（1）求证f(x)为增函数,（2）若f(2)=1,解不等式f(x的2次方－x－2)