求而不得未必是遗憾

如图所示,细杆AB搁置在半径为R的半圆柱上,A端沿水平面以等速v作直线运动,细杆与水平面夹角用θ表示.图示之瞬时,细杆与半圆柱相切于C点,此时杆上C点的速度量值是= ,圆柱面上与杆相交的一 哪位英语高手可以帮我把这句话翻译成英文：数学归纳法在中学数学教学中的运用. A、B两小球用长为L轻杆连接、A球只能沿内壁光滑竖直滑槽运动,B球处于光滑水平面.开始时竖直静止,由于微小扰动,B开始沿水平向右运动、一直质量分别为mA、mB 求1、A落地速度 2、A球机械能 已知a,b为复数,给出下列四个命题1若a^2属于R,则a属于R或是a纯虚数2若a的模=b的模,则a=正负b或a=bi3若a+b属于R,则ab属于R或a=b共轭复数4若a+b>0,且ab>0,则a>0且b>0 I have only a few friends in Nanjing,but my he has a little——（few）英语高手进…… 1.Jim has many friends in his class.(划线部分提问） _____ _____ friends _____ Jim _____ in his c1.I want to keep healthy.(同义句）I want to _____ ____ ____ _____.2.What does your mother do?（同义句）_____ is your _____ _____?1.Mr.Gree 若n是奇数,则{（1+i)/√2}^4n+{(1-i)/√2}^4n=多少题目有点麻烦 还望高手指教 Only ______girls can dance well in our class. A. a few B. a little C. little D .few The boy is new in our class,so he has _____friends now.A few B a fewC little D a little vaporization和evaporation这两个词有什么区别?好像一个是汽化一个是蒸发但字典里都是蒸发的意思呢? Regalami un fiore rifiorirò是什么意思啊?意大利语` Much of our electricity is produced by plants that burn coal as fuel.求翻译 Reduce the amount of tea you consume 帮我翻译一下 who you want to talk with ,no me 我节奏大师挑战时0个miss,为什么还是D,朋友2个miss都是A 求助：divided into与 composed to的区别求详细解答,不要只翻译这两个词组的意思A hamburger is composed of bread,meat,salad,and vegetable.A hamburger is divided into bread,meat,salad,and vegetable.这两个句子 第二句对的 英语翻译 Un Amico E' he _____fatter than before.是填gets还是is 从左到右分别是Miss A里的谁 He is getting _____ and _____(fat) than before. Carla and I tied for that last position.谢 秋瑾是怎么死的求大神帮助 be separated into different groups翻译 小茶楼怎么样 1. ()go home at 5:30 every day. 讲原因 A don't B,aren't C,doesn't come　face　with是什么意思 关于《核舟记》的一个问题为什麽文章不按船头-船舱-船尾的顺序写,而是按文中的顺序写?文章3段重点描写的是谁?描写的中心（3段的）是什麽?10分 The old writer lives in a (an) house,but he doesn t feel .选择lonely 和 alone 秋瑾是怎么死的如题 核舟记中的一个问题!它说的是、文中最能体现王叔远构思巧妙、技艺精湛的一句话是、“ ”作者对核舟技艺发出赞叹之情的语句是“ ”晓得者速回! 秋瑾怎么死的 300字