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若从集合A到集合B=｛-1,1｝的函数f[x] 满足 f[x]+f[-x]=0 求A中所有元素的和为多少 《陈太丘与友期》刻画了陈元方什么的特点? 陈太丘与友期中陈元方的简介. 寒假要写15篇作文,已经写了12篇了,还剩下3篇实在是不知道写什么了,请大虾们给我出点作文题目吧,注意：我平时一般都待在家里,没怎么出门,而我妈又命令我不准写读后感（写了几篇了）,最 一定量的FE与含1MOL HNO3的稀硝酸恰好反应,则被还原的N原子数小于NA这句话有错?错哪? 常温下,1L0.1mol/L的硝酸铵溶液中氮原子数为0.2NA,对还是错? 1mol的硝酸铵(NH4NO3)与几g的氯化铵(NH4CL)所含的氮原子的质量相等 该怎么算啊 The person she _____ at the company meeting may be the director of the sales department.A.referred with B.referred to C.mentioned with D.mentioned toB和D的差别是什么？ 跪求：一道地理题的详细解析!当解答题来做!（07年海南地理卷）我国某企业在伊斯兰堡（33.7°N,73.1°E）、利雅得（24.6°N,46.7°E）、东京（35.7°N,139.8°E）、悉尼（33.9°S,151.2°E）、底特律（42.4 一道英语单选题,How do you think _____dealtwith the broken machine.A.he has B.has he C.dose he have D.had he.请明白点讲下,重点讲下A,B的不同,为什么A而不是B老老师为什么说do you think是插入语呢? 16岁100米跑11秒20左右可以吗 我初三100米11-12秒 怎么样才能跑快? AQUALOVERS~DEEP into the night~歌词 跪求Into the white night 的歌词,发到私信或复制到下面 into the into the 最好有关于这个短语的句子,用法什么的... 谁有lost into the night 英语单选题（原因）The discovery of the new evidence led to _______.A.the thief having caught B.the thief being caught 英语单选题,要原因Greater efforts to increase agricultural production must be made if food shortage___avoided.a.is to bec.will be 英语单选题(理由~)1.This is the house ( )he once lived ( )when he was a child.A.which ,in B.that,/ C.where,in D.which ,/2.My father ( )from home for about a year.A.has left B.has gone C.has away D.has been away3.Reding is ( ),but practing is al 如图,三角形ABC中,∠BAC=90度,AD垂直BC于D,CE平分∠ACB交AB于E,交ad于F,求证:∠AEF=∠AFE 在三角形ABC中,角ACB=90度,D在BC上,CF垂直AD于F,CE垂直AB于E,求证 角AFE=角B 在三角形ABC中,角ACB=90度,D在BC上,CF垂直AD于F,CE垂直AB于E,求证 角AFE=角B 孩子写作业很慢,怎么办? 孩子写作业超慢,怎么办 the writer often sat up far late into the night working (on a new novel为什么不用介词for 选择题If I can help ( )I don't like working late into the night.A so B that C it D them if I can help it ,I din't like woking too late 如何翻译 If I can help___,I don't like working late into the night.A.so.B.thatC.itD.them选C?这四项分别用于指代句子的那一部分? 远洋船舶是什么 船的3000总吨和3000吨有什么区别 远洋船舶是什么意思 已知三角形ABC中,DE平行BC在AB上取一点F,使三角形BFC面积=ADE面积,证AD2=AB*BF