物理中运用高斯定理求电场强度、磁场强度时什么时候是2pi*r,什么时候是pi*r^2

急需一份别惹蚂蚁的英文观后感!非常急!一定要英语观后感!80字左右! 《别惹蚂蚁》观后感 中译英《别惹蚂蚁》观后感 故事讲述：一位名叫卢卡斯的少年,因经长破坏蚁巢而被蚂蚁巫师——佐克变小了.卢卡斯变小后成为了蚁穴中的一员,成功地击退了吞云吐雾 口字和得字拼出来的字念什么?怎么拼写?(口在左,得在右) 这个字念什么!《〈栗〉》 用汉语拼音给我拼出来 疯狂原始人英语观后感80词 我是处女座 想要一个以w开头的女生英文名 英语单词总是记不住它的中文意思,有什么好方法吗? 英文单词中以E 和 I ,A开头的单词,应怎么发音 求记英语单词及其对应意思的方法.多多益善! 求B开头 有ai 读音的英语单词 英语ai的发音规律是什么?什么时候不发音?比如certain、curtain等 She takes much interest in music and dance.改为同义句She is _______ _______ music and dance. she takes interest in music and dance改为同义句 She is _______ music and dance. who is the girl?she is singing along with the music?合并成一句 The girl likes music very much.She needs to learn to play an i__快 she studied _European history and developed _ interest in_ medieval art.she studied _European history and developed _ interest in_ medieval artA,/ ...an,the B.the ,an...the C /...the.../ D.an .../...the此题考察英语冠词用法.我对这个不 处女座最好听的英文名字我想要的英文名最好要和蔡依林的英文名差不多（我是骑士）（Jolin,蔡依林的英文名）,最好带意思. 英文名Selena和Setlla哪个更好啊 最好跟白天的好天气.晴空有点关系的.急,给个你选择其中这个名字的理由,为什么会选它? selena与selina是一样的吗?读音是一样,是变异的词吗?那哪个是原本的? selina这个英文名字是何意?我想知道selina是什么意思? 英文女名赛琳娜的拼写是selina,还是selena take an interest in 和 be interested in 的区别用法 be interested in=take an interest in还是take interest in 固定短语.对...感兴趣have interest in sth.还是have an interest in sth. be interested in 对什么感兴,还是be interest in 对什么感兴趣,哪个对? 是have interest in 还是have interested in 女性英文名除了selina还有什么名字有月之意,或者跟月有关的也可以! 高手速来1991年处女座 女生英文名希望是a开头的,希望有希望的意思或者希的谐音 The teacher said to us,“Don't listen to music in class改为间接引语 he teacher said to us,“Don't listen to music in class改为间接引语 Don't listen to the music when _____ teacher in class.A listen to B listen C listening这题该选什么呢?为什么? "listen to the teacher carefully in the class."my father said to me.→___________________.one of the doctors said "let's go on with the operation."→______________________."don't spend too much time on the Internet",the teacher said to Tom.→_____