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有谁知道弧线球在空中是如何受力的? 一个人将一个30N的球推向空中,问受几个力忽略空气阻力 I have always been honest,and it doesn't matter _I'm talking to.A.who it is B.it is who选哪个?为什么?那为什么it is who 不是陈述语气？ 会变颜色的杯子喝水有害吗? ______math books.They're____ books A、Their；they______math books.They're____ booksA、Their；theyB、Ther're； theirC、Them； theirD、They；them's 一个单摆的摆球运动的最大位移处时,恰好遇到空中竖直下落的雨滴,雨滴附着在球的表面上求摆球经过平衡位置速度变化,周期,振幅的变化?/?请说的详细些谢谢 ______Math book,they'er_____books.A.Their;______Math book,they'er_____books.A.Their;they B.They're;their C.Them;their D.They;them's 以初速度为30米每秒在空中向上抛出一个球.经过2秒 4秒后小球的位移为多少. ( )favourite is books括号填they还是their He can only put a strawberry on his noise ,but he can put some （ ）on his head.填开头字母是s的单 ______(their)are ____(they)books. Put some ice on my head 这个句子对吗还有 i should take a bath with cold water 炮轰的脑袋,梳了个雷劈的缝 什么意思 装逼遭雷劈是什么,雷劈么? Liu Tao can put some bookson his head.改否定句 大树下为什么容易遭雷劈? 飞机会被雷劈到吗?求大神帮助 被雷劈中的几率有多大拜托各位大神 I have always been honest and straightforward,and it doesn’t matter ______ I’m talking to.A.who is it B.who it is C.it is who D.it is whom I have always been honest and straight forward,and it doesn't matter___I'mtalking to.A.who is it B.who it is C.it is who D.it is whom选什么?为什么选这个? I have been honest and it doesn't matter who I am talking to的强调who的强调句 请熟悉卡尔曼滤波的大神指教,卡尔曼滤波结果接近观测值,说明什么?为什么说越接近观测值就越接近真实值呢 卡尔曼滤波如何预测卡尔曼滤波分为估计和更新两个阶段所谓的对t+1时刻的预测是不是就是t时刻对t+1的估计?到t+1时刻,根据我的预测和实际测量值,得到一个更准确的t+1时刻的估计值,再根据 如何确定卡尔曼滤波的观测矩阵 甲骨文是写在哪上面的? 甲骨文是写在什么上面的? 上字的甲骨文是怎么写的 Most of my day is full of Iessons What a day full of activity!这句话中的full of activity是什么用法,在句中充当什么成分? let us go and have a drink have a drink什么意思have和drink都是喝的意思,这不矛盾吗 电压表测量值与真实值哪个大?在电压表内流过的电流很小,一般忽略不计,如果要计算,那个更大? 如果考虑电流表是由G表和电阻并联而成的,那么电流表测量值真实值谁大?