求任意一点的曲率

将某种盐A的水溶液,加热蒸发至干,再加热后仍得到盐A的是（） A.K2SO4 B.CuCL2 地址 about: 小时代2青木时代 顾里的生日会上南湘为什么敲两下杯子 Does Yang live far away fomo the school? The twins and their mother live in a park in Guangzhou什么意思 纪伯伦的《浪之歌》,帮我仿写第五段 下面就是例子 曾有多少次,当美人鱼从海底钻出海面,坐在礁石上欣赏星空时,我围绕她们跳过舞；曾有多少次,当有情人向俊俏的少女倾诉自己为爱情所苦 Man Next Door 歌词 my next door neighbor johnson seems to have ____opinion on the show last nighta.rather the strongb.rather strongc.a rather strongd.the rather strong答案选c为什么？ 毒性最强的蛇生活在陆地上还是海洋里? 童年是旭阳,老年是夕阳,岁月是充满变幻的风云,理想则是人生永远的北斗.以英名与事业为话题,另写一组句子． 大家happy new year 世界上最毒的蛇,是在陆地上还是在海里面? There is nothing noble in being superior to some other man.The true nobility is in being superior There is noting noble in being superior to some other men,the ture nobility is being superiou to ..帮我翻译一下 The question————human being can enter space with a man-made ladder puzzled all the people all over world .A .what B.which C.that D.whether是不是选D啊~如果不是的话给我讲讲原因吧... Justin Bieber 的happy new year 的英文歌词和汉译 Are you free tonight? this is crystal.do you tonight free?we are having a movie night 如何礼貌地用英语恢复（地道的） Since you are free tonight ,why not ____ my invitation to the party 为什么用 consider 而不是 accept 童年是旭日,老年是夕阳,岁月充满变幻的风云,理想则是人生永恒的北斗.出生是天明,死亡是天黑,旅程布满难辨的岔道,智慧则是生命永恒的雷达 意思 I miss my friend never这句话对不对 I miss my old friend sometimes=I miss my old friend ___ ___ ___ ___ 帮忙设计一下“happy new year"做手抄报用的. All of us felt surprising when we heard of this surprised news. 是否正确 英语翻译1、祝您永远平安,幸福.2、爱你的哥哥 英语翻译一句是 Tu sais que je t’aime,mains tu as me refuse.还有一句Je t’adore toujours. My friend ,i miss you 翻译过来是什么 I miss my friend sometimes 否定句I miss my friend _________ I don't the same to you 着句怎么读 How long does it take to w__there?下面的回答是It takes me about five mintes 求回答 It takes ____five minutes ____there .A him,walk B he,to walk C him,to walk D he,to walk Please cut the cake ______________(两半)