确定一个三角形

用细绳吊着一个质量为m的小球,使小球在水平面内做圆锥摆运动,关于小球受力正确的是:A 受重力 拉力 向心力B 受重力 拉力C 重力D 以上均不正确 孩子不好好写作业怎么办?写作业总得我陪着,真麻烦 孩子不想写作业怎么办? 英语翻译No record of the work of Mr.Ed,during an active life,has been given to the world. 孩子不好好写作业我该怎么办?已经十岁了.今天我说他了,孩子很听话答应得很好,只是做的不好. 小孩晚上不好好写作业怎么办 请教英文歌曲达人,歌词有句I hear the music in the air我就听清楚这一句,但是忘了是 i hear the music in the air 还是 i hear the music fly in the air.而且这句不是在副歌里,也不是在前面.歌曲比较舒缓,但是也 how to Be a successful Eiglish Lear 怎么写条件1jane is a vary slow reader,she wants to improve her reading speed 条件2Li ming wants to improve his listening给他们一些建议作文80字 do i have to say sorry to u ?是什么意思 我家孩子不好好写作业, 用长为L的细线系一质量为m的小球,悬于o点,将小球拉至细线处于水平的位置后静止释放,不计阻力,重力加速度为g,求：小球摆到最低点时的速度大小；小球摆到最低点时细线的拉力大小 用长L的细线系一质量为m的小球,悬在O点,将小球拉至细线处于水平位置后由静止释放,不计阻力,重力加...用长L的细线系一质量为m的小球,悬在O点,将小球拉至细线处于水平位置后由静止释放,不 用长为L的细线系一质量为m的小球,悬于O点,将小球啦至细线处于水平的位置后由静止释放,不计阻力,重...用长为L的细线系一质量为m的小球,悬于O点,将小球啦至细线处于水平的位置后由静止释 bring后可接的介词 Make me busy!Too busy to think too much! He is too busy with his own work to pay that much attention to allof mine .请问这句话怎么分析?T...He is too busy with his own work to pay that much attention to allof mine .请问这句话怎么分析?To pay这里又是怎么回事? He m___ his mother very much,but he is too busy to write her 空中填什么 It takes a tough band to make a tender bird 这句话是怎么翻译成 “严谨决定一切的” l can make a puppet[否定.一般?】 Was It Something I Did't 3QWas It Something I Did't Say 歌手:98 Degrees 专辑:98 Degrees 中文歌词,不要翻译软件翻译的 刚性基础和扩展基础有什么区别 The Ballad Of Mona Lisa 歌词 英语翻译 he works hard and tries his best to busy enought food for his family的翻译 Mr Hill works in a factory.There he 1 a truck.He’s busy all the time and can’t look after histhree-year-old son.And his wife does all the 2 and she takes good care of the boy.Bad luck!Once the young man was very 3 after over twenty hours’ work. 一 根据所给首字母提示,完成句子.1.They are good a_____ Chinese .2.How w______ do you play badkerball.3.You can jump r_____ high!二.按要求写句子.1.Daming and his father went to ( the Great Wall ).就括号部分提问.2.I bought ( 前面接着最后造句 太阳雨太阳能与四季沐歌太阳能哪个更好用,质量最好 太阳雨太阳能和四季沐歌太阳能产地各是哪里? fe和al的混合物共4.6g投入足量的硫酸,充分反应后,在标准状况下放出0.15mol气体,问fe与al物质的量之比除了常规的设x和y的列出方程组得求法外,因为这道题只是要求求比值并没有要求具体的x与y Fe和Al的那个地壳金属含量百分比不对啊!怎么答案会是对的? 将一定质量Fe,Al组成的混合物投入到足量的稀盐酸中……