回声定位原理

no less 和no 关于零向量的方向问题课本上有这么几句话：零向量的方向任意零向量与任一向量平行练习中有这么一道题：如果非零向量a与b方向相同或相反,那么a+b的方向必与a、b之一的方向相同.×综上, 如何理解零向量的方向? like my mother does中的does要怎么理解? Like My Mother Does 歌词 英语I like sports and so does my mother 为什么用so does 三国演义测试题,如下图, 零向量的方向确定吗? 两个零向量的方向关系既然零向量的方向是任意的,那么两个零向量的方向一定相同吗? it is no use ()much but ()lessA to talk to doB talking to docto talk doingDtalking doing 要有分析.It is no use____ much but ____ less.It is nouse____ much but ____ less.A.to talk;to do B.talking;to doC.to talk;doing D.talking;doing____English novels is really great fun.A.Read B.To readingC.Reading D.To read选C还是D？ It is no use .和 It is of no use ...之间的区别?例如:Her brother doesn't want to go to HongKong with you.It is no use trying to persuade him.He has already made up his mind to go to that university .It is of no use to change his idea.为什么 he is no less a he is a play writer,but he is no less a poet请问这句话是什么意思 ---Is your headache getting ( ---No,it's worse.A.better B.bad C.less D.well （为何选B,A呢?） 用一些边长1厘米的正方形拼大正方形,拼成的大正方形四周是白色的,中间是黑色的,研究大正方形每边正方形个数与中间黑色正方形个数的关系 写出一个关于解是x=-1,y=3的二元二次方程 求解一道二元二次方程组x^2+y^2=2 ； (√3-1)x=(√3+1)yx^2+y^2=2(√3-1)x=(√3+1)y算不出来啊!晕了 如图,是一块黑白格子布．白色大正方形的边长是14厘米,白色小正方形的边长是6厘米．问：这块布中白色的面积占总面积的几分之几? no-less-weighty什么意思还有Laughter provides powerful,uncensored insights into our unconcious. 不属于净资产类会计科目的是（ ）.A.零余额账户用款额度 B.事业基金 C.专用基金 D.事业结余 纠正和改正的区别 急求纠正语法,并更正!Each people all have own dream,dream leads us forward.My dream is to be a dancer.Since I was young,I began to practice dancing,no matter how hard the process of practice,I have always insisted.I hope one day I can stand o 请帮我更正下语法,1.Yes,we confirm that the material is food graded.2.We can print 2 colours logo,but could you send me the logo design,it will be easy for us to quote the price.3.We attached some other models for your choise,please kindly che pc蛋蛋幸运28余数是什么意思?余数怎们算? 用瓶子.气球.水怎样收集人体呼出的气体 C语言编程用公式法求π,① 公式π/6=1/2+(1/2)*1/3*(1/2)3+(1/2*3/4)*1/5*(1/2)5+(1/2*3/4*5/6)*1/7*(1/2)7……；② 编程求π的近似值,当数列的最后一项小于10-6为止；输出π值,小数点后保留6位有效数字. 二不共线向量是两个向量不共线的意思吗? 向量共线是指什么,共线向量与他是一个概念吗?可以举个例子吗? 共线向量怎么个定义?不是共于一线吗 对一个满二叉树,有m个叶子结点,n个结点,深度为h,则（ ）.A.n=h+m B.h+m对一个满二叉树,有m个叶子结点,n个结点,深度为h,则（ ）.A.n=h+m\x09\x09\x09B.h+m=2n\x09\x09\x09C.m=h-1\x09\x09\x09D.n=2h-1 1甲、乙两地相距720千米,一辆客车和货车同时从甲、乙两地出发,相向而行.客车每小时行100千米,货车每小时行80千米.几小时后两车相遇?2甲、乙两地相距720千米,一辆小轿车和一辆货车同时从 设ab是两个不共线的向量,若c-a+kb与d=-2a+b共线,则k=?