matlab求实部虚部

我讨厌数学但喜欢物理,这是不是很矛盾? 对于一个点电场.F=kQ/r,然后我们求功,使用积分,得到W=-kQ/r.那么假设给一个在点电荷旁边的电荷W0的动能则它最远可以离开点电荷距离r0,现在如果只给它W/2的动能,根据常识（点电荷电场是在减 英语翻译麻烦再说说这首歌怎么样! the boy is too short to reach __ the book __the dictionary on the shelfa) both andb) neither norc) either or The boy is too short to reach __the book___the dictionary on the shelf.a.both...and b.neitThe boy is too short to reach __the book___the dictionary on the shelf.a.both...and b.neither...nor c.not..but d.either..or He is so short that he can't reach the book on the shelf.(改为同义句)He is _____ _____ _____ _____ the book on the shelf.He is _____ _____ _____ _____ _____ the book on the shelf. the boy is too short to reach _ the book _the dictionary. 请问这里应该用either or 还是both and呢.?为什么另一个不对呢?谢谢! Tom was too short to reach the candy box on the top shelf.(保持句意基本不变)Tom was _ _enough to reach the candy box on the top shelf. 英语翻译1：衣橱里有三件衣服2：有一台随声听在床头柜上3：有两台风扇在床上4：桌子下有10个苹果和1个球 小学生英语自我介绍 下午就要比赛了急求!中文：各位评审好,我叫XXX,我来自XX,我今年X岁了,我最喜欢的就是踢足球和玩电脑了.我不喜欢吃胡萝卜.之类的,最好短一些,有分 ,赏50分Seasons in CanadaI love summer!In summer,the weather isusually very hot,and I can swim in the sea.Spring is beautiful,but in Canada it often rains.And it is hard to nplant flowers in the rain.I love my garden!It is so nice to watch the flowe ------------------,i have never seen anyone who's as capable as johnA.As much as i have traveledB.Now that i have traveled so muchC.much as ihave traveled 这道题为什么选D 第九题选什么?为什么? 1.I____the piano at regular intervals for many years when i was a child.a.played;b.was playingc.have playedd.have been playing 2.-Simon won the first prize in the math contest,do you konw?-yes.___.he's won several first prizes on the subject.a.in the 泰坦尼克号歌词翻译不必管别的,只按原文翻译,不要添加或删除自己理想化的成分如果好我一定会加分的 i demand that John ___there at once.A,wentb,should goc,should be gone d,goes说明理由, 连词成句 Linda is ,next,in,picture,the,are,brothers your for of the thanks photo Linda family连词成句 is,on,Linda's,sofa,ring,the连词成句 is on wall the there picture a连词成句 glasses the shelf your are on 连词成句 英语翻译1 ACROSS CHEST(1 BLW ARMHOLE) 2 BODY LENGTH FR HPS 3 ACROSS FRONT（6 1/2 DN HPS 4BOTTOM HGHT 1*1 RIB 5 SLEEVE LENGTH FROM CB 6ARMHOLE-CURVED 7MUSCLE-1 FR ARMHOLE 8 FORARM(7 FROMSLEEVE HEN)9 NECK OPENING-SM TO SM 10 UNDERSLEEVE 11 NECK DR 英语翻译这是美国尺码,求全图XL号解释,52.34.34.具体是多少厘米. 选择题.The books are( )the shelf. the books on the shelf belongs to mary 对么 急需人教版2012英语新目标课文和单词的清晰MP3录音 图书馆在邮局和银行之间,英语句子 我感觉高中很难学 但是我想学好 可是不知道这么办了 我英语差 化学现在听不懂 物理上课听的懂写练习就半对半错 我想快速把中学所有知识学完,但是我发现我物理八年级下册看不懂,数学也是模模糊糊,我想一天物理学两个元,数学学两个单元,但是我又看不懂,我改怎么办? 谁能告诉我初一的英语都教些什么啊 (一定要是具体的）快,我赶时间那, 现在 都教什么内容呀?