3．若A和B均是m×n阶矩阵，则A与B等价的充要条件是R(A)=R(B)。

现在才开始准备考三级PC,有什么书推荐的? 这句话中,前一个词加三单s,为什么后一个不加s?这是阿凡达6分51秒时的台词Out there,beyond that fence,every living thing that crawls,flies or squats in the mud (wants) to kill you and (eat )your eyes for Jujubes看括号,为 三单现时 人名后动词加s还是只要是词都加s? 生活中的英语标语有哪些?例如小心碰头、小心地滑等等、、、 律师事务所该翻译成law firm 还是lawyer firm? 49 U.S.C.§ 14706(a) 是不是法律?是有关于海商法提单的,是用来控制承运人的什么,或者是法律或者是案例,按照你的说法感觉不能拆分解释啊, Jack is an English boy.He wants to have friendJack is an English boy.He wants to have friend in China.He hes a healthy eating（1 ）He like fruit and vegetbles.（2）are his fruir salad （3）dinner.He doesn't eat（4） law firm 与law office都可以翻译成律师事务所,但是二者有何区别? cause it's against the law for a learner's permitfor a learner's permit for是什么词性?整句直译怎样 he was involed in the establishment of the law firm 其中firm是什么成分 以下几个词组用英文怎么表达?1\秋末冬初2\深秋时节3\腊月4\上半月 下半月 关于一个英文的词组表达就是中文“一边.一边.”的英文,该怎么说? 做演讲的英文词组怎么表达要高级一点的词组 I am an English teacher改为疑问句 I am an English bay.变成一般疑问句,并作肯定或否定回答 I English am an boy I am an English boy?(改成否定句) _____ _____ an English boy. I am an english boy.哪儿错了?请改正过来 "请轻拿轻放"的英文翻译谢谢~ 英语翻译它的比较级是什么? (易碎品 轻放 ) 请翻译成英语 A：He has made___ friends here since he came to his factory B：what a pity!A.quite a fewB.only fewC.only a fewD.many 英语翻译 billy has made quite ____friends since he came here. A a little B little C few D a few hello,everybody!this is the second year of our 500 WORDS short story writing__last year was thefirst time and the result was good.So we decided to have it___.(prize,comepetition,future,win,again)选词填空 There were many zoos in our city last year.(对划线部分提问) ____ ____ there in your city last year? 英语中ed ing 谁修饰人谁修饰物 英语中用ed修饰物,用ing修饰人怎么用,怎么翻译 #[54] The book _____ cover is red was borrowed from the school library last week.A.which B.where C.whoseD.of which翻译并分析. 连词成句 interesting i an from story the library book last borrowed monday I borrowed a book from the library.It was written by Bing Xin.改为定语从句怎么改? I borrowed the book last week.(同意句转换)