单位矩阵有什么性质

在英语中什么时候用her什么时候用hers. 英语中什么时候用hers her 's s 鱼加希这个字谁帮忙打出来! 地动仪在哪放着呢?它能测出来地震吗? E=mc^2 whywhy? 求Life is XXXX的作文,要120字左右的 Ruin人名翻译 有一首中文歌,julie julie 什么的 julie名字的出处 别的意思 什么败走华容道不出所料. 牙璋辞凤阙的阙怎么念 谁知道“牙璋辞凤阙”是什么意思?“阙”怎么读? ___ then,my mom has worked as a teacher. 1我爷爷曾经是一位老师. my grandfather _______ ______ ________ a teacher. 联想中学本学期前三周每周都组织初三年级学生进行一次体育活动,全年级400名学生每人每次都只参加球类或田⑵如果第三次参加球类活动的学生不少于200名,那么第一次参加球类活动的学生 Has your grandfather ever worked as a teacher?Yes.He______Chinese in a primary shool when he wasyoung.A.has taugut B.teaches C.used to teach D.is teaching急 英语正确形式填空五分钟求解My father worked as a teacher in his _____（twenty）. 英语 代词题 Shylock,how can you hope for mercy yourse英语 代词题Shylock,how can you hope for mercy yourself when you show _____.[ ] A.it B.nothing C.none D.no one 为什么选c My grandfather can make tools.(同义句 北美野牛、野马、北极熊、加拿大棕熊、野狼、灰狐、北极白狐英文怎写 请问1.2mm钢板理论重量是每平方是9.42Kg,那么1Kg是多少平方,帮忙列个公式 1.55平方怎么算 钢板1.26平方,厚3cm,长1m,密度是0.0785.怎么算重量(公式?),麻烦举列说明! "随笔"这个词,在画作里又如何翻译呢? 俄罗斯是熊,美国是北美野牛,英国是小毛驴,那么加拿大呢? 英语翻译身边总有呢么多的事情不如意毕竟生活不能我说什么就是什么样我们只有被改变的命运?可笑.只不过是 平凡的一个人而已~心里却总会有呢么多的抱怨心痛了呵呵希望把一切事情都做 “用英语写随笔也不错”怎么翻译 阅读理解An old gentleman was walking slowly along a street one noon when he saw a little boy who was trying to reach a doorbell which was too high for him.He was a kind-hearted old man,so he stopped and said,“I’ll ring the bell for you.” T 弟子规 长者先的长读什么音 I met a man ( ) my grandfather worked with 30 years ago.A.who B.whom In my opinion,my grandfather was a deserved man man in photo grandfather the my 如何组成一句话