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牛顿环为什么是由空气薄膜上下表面反射形成的呢?牛顿环产生的原因是由于光在空气薄膜的上下表面中反射出现光程差.那为什么不是在玻璃上下表面反射出现的光程差呢? shell排序法是怎么实现?有关键码（16,9,4,25,15,2,13,18,17,5,8,24）递增次序,接下..用初始增量为4的shell排序法,一趟扫描后的结果为? 请老师给我教一下 在一个化学方程式里怎么 配平 7. —Does Liu Hui serve in the army? —No, but he in the army for three years. A. servedB. has servedC. is servingD. would serve用过去完成时 是一般过去式? 图中后三道化学方程式配平 如图. 化学方程式配平最小公倍数法具体怎么用?最好是图片,文字叙述的不是很清楚 谢谢～ 在锐角△ABC中,高BE,CF交于点O,则可以推断角A+角BOC=180°,为什么?又当△ABC为钝角三角形（角A为钝角）时,上述推断是否成立? 三角形ABC中,角A=50度,高BE、CF或延长线交于点O,则角BOC=?度 在三角形ABC中,角A=70,高BE,CF交于点O,则角BOC=rg I'll Make Love to You-End of the RoadBabyface.-.[MTV Unplugged NYC 1997].专辑.(mp3).[VeryCD.com]里的第七首想知道歌词··谢谢··不是第六首的那个I'll Make Love to You里面有句“you belong to me··I belong to you” 4、Liu Yun often does sports after school.（画线does sports）（画线提问） 供给曲线和需求曲线同时向上移动 商品的数量和价格的变化.RT 32,为什么选c不选a 一辆车一杯水一匹马一块玉什么成语 look ,one of the boys------(have)a big apple happily now have big The boys a big ball.用have/has If you want to see a movie,you should buy a ( ) a.magazine b.ticket c.postcard 代词有几种代词 代词is that qinghai-tibet railway plays an important role in china's railway history the topic that you're going to come to 这句话怎么翻译 ,句首的that 什么作用 可以用 it 高中英语关于代词I have not read____of her novels,but judging from the one i have read,I think she is a promosing writerA.none B.both C.any D.either请问为什么 一道高中英语代词题I was told that my father had e-mailed me the other day ,but I didn't receive______.A.it\x05B.one\x05C.anything\x05D.nothing His sister usually ——（do）to school at 7:00 am. 瓜怂(音译)陕西话什么意思啊、rt不知道啥意思 瓜怂的意思理解了…… 请教“土怂”的具体意思···囧 瓜怂是什么意思 is（ ）possible to fly to the moon in a spaceship.用it 还是that 新概念英语4册全部学完英语能达到什么程度? 新概念英语4册学完,如果学得还可以等级可以过4级吗? they bought the cheapest bike.{对划线部分提问} _____ _____ did they buy?划哪个都可以,答句对就行 关于中级微观经济学的问题An indi¤erence curve is downward sloping because you need to pay a positive price to buy each good from the market.这句话对吗,为什么