软体动物神经系统

I---(never return)to my school since I---(leave)there in 1991 here what my siter said怎么改错 一道有关生物的排列组合问题mRNA的四种碱基决定几种氨基酸 应该是 4的3次方种 第二册的生物课本上也有介绍 解释下这里的2那个式子什么意思,学过排列组合,所以不用考虑知识有没有学过的问题. 排列组合与导数结合求证Cn1+2Cn2+3Cn3+……+NCnn（其中CnX为排列组合的式子）=n·2的（n-1）次方 函数与排列组合结合的问题建立从集合A={1,2,3,4}到集合B={5,6,7}的所有函数,从中随机抽取一个函数,其中值域为B的函数的概率为多少?求详解.想的脑袋都大了9/16 3/16 4/9 8/9 stop right here中文意思 在这个句子中的come to call he will come to call you the moment he finish his work.这句话又应该怎么翻译呢? Save time since a trace of courage,is always the real attack will destroy them! If we don't eat them,someone else will eat them.中someone else 可以换成anybody else吗 为什么生活总是有太多的事情不是我们可以承受的 却依然会发生 how a about————（ stay） here It's OK stop here.sth about nothing翻译 eat well,take good care of my wife,中文 怎么说 My mother wants me to eat well.为什么用well不用good Last One Standing是什么意思RT we're the last one standing怎么翻译呢 He know anything about the problems.这句话的宾语是anything,还是anything about the problems?我这个问题是一个选择问句,答案就是我上同说的两种,希望能解一下为什么要先这种或选那种. 用关联连接词把下列各对句子连成一个简单句 He sold the land,He sold the house well runner eat怎么排列 Before going to bed to phone again怎么说 you heard me before yet you hear me again .then i die till you call me agaiHurry up You heard me before,yet you hear me again Then I die ,till you call me again.What am I Did she call before she was going to come的意思 怎么记单词? 怎么快速记单词 怎么样快速记单词? 中世纪骑士英语简练点 有关中世纪骑士的英文电影里面有马术还有大教堂,比较励志的片…… 中世纪英语怎么说 中世纪骑士的准则（中文+英文）如题,要中世纪骑士的准则,记得好像是八条,另请达人翻译成英文, Sunday was going in to be the birthday for me ang my other two classmates I am going to do all I can to_ the unpleasant impression.A dispose B shift C transfer D remove每个选项的意思是什么,为什么选D?