海水提取溴和镁

一道关于复数的数学题 k^-k^+9/2k+9>0＾表示平方...就这个,＾＿＾k^-(k^+9)(2k+9)>0不好意思，有括号滴哈 一道关于复数的数学题…求高手(1+i)^2011/1-i^2010=? C语言里如何实现乘幂运算比如 10的3次方,输入10^3 =1000吗 为什么啊 我要怎么输入啊.还是 1e3?那我如果输入10的a次方是不是 1ea呢?ea.ea. 请问大家T/T在物流, 文言文 竹 货代中的140T是什么,总是会说,这周哪里几个T几个T,还有TEU, 甲文：竹之始生,一寸之萌耳,而节叶具焉.自蜩腹蛇蚹以至于剑拔十寻者,生而有之也.今画者乃节节而为之,叶叶而累之,岂复有竹乎!故画竹必先得成竹于胸中,执笔熟视,乃见其所欲画者,急起从 我要写竹的文言文 显示器出现横杆是怎么回事?有图 经济学专有名词中英对照表及解释 求哈里 波特里专有名词的中英文对照 关于“电力设备”的专有名词中英文对照,哪位能提供啊?谢谢!感激不尽! 学科专有名词中英字典在国外学习 英文书中的很多单词的意思和普通字典的意思不太相同 请问谁知道能查询专业学科的专有名词的词典 能从电脑上用的 这样不会的词组可以查询到了就 比 用正确形式填空________ are they _________(sing) the song this moment.In the empty room. who ―（sing）the song in the hall this morning那个sing应该怎么填 I wanted to cook some nice food for the party.I bought a cookbook,which expained how French food接上 is prepared.这句话是什么意思、这是个什么句子 he has many reasons to kill himself.如题 真的没分了 He has an _________ to kill the thief who stole his wallet when he saw him iimportanceB、impossibilityC、impulseD、import His technique has developed to the point __he can help kill the latest computer virus going around.His technique has developed to the point __he can help kill the latest computer virus going around the city .A.that B.which C.when D.where答案是D, His technique has developed to the point __where_ he can help kill the latest computer virus goinground the city.我想问he can help kill the latest computer virus.这个句子主语,谓语是哪些看不懂拜托啦 51.如图10所示,在x轴上关于原点对称放置2个电性和电量相等的点电荷 ...51.如图10所示,在x轴上关于原点对称放置2个电性和电量相等的正点电荷q1 和 q2则对y轴上一点P的场强的方向能作出的判断 系统中电源开关脱扣电流与下级回路中开关 匹配 原则 HRS4H-S-DC5V继电器线圈接法分正负吗? 联想M7650DNF加墨粉后怎么还有墨粉量低 变压器为什么正负线圈都要绕那么多匝,为什么不将正负线圈的匝数都除以相同的数,升降压效果应该一样啊,而且还省材料. 英语翻译broken this fragile thing nowand i can't,i can't pick up the piecesand i've thrown my words all aroundbut i can't,i can't give you a reasoni feel so broken up (so broken up)and i give up (i give up)i just want to tell you so you knowhere He has much food at lunch time.（同义句） He has ＿ ＿ fHe has much food at lunch time.（同义句）He has ＿ ＿ food ＿ ＿. 英语翻译There's a place off Ocean Avenue,Where I used to sit and talk with you,We were both 16 and it felt so right,Sleeping all day,staying up all night,Staying up all night.There's a place on the corner of Cherry Street,We would walk on the bea Lily has fruit for lunch at school是什么意思 捕鼠能手是什么鸟 三道关于解斜三角形的题目!1.在三角形ABC中,三边分别长a,b,c,求BC边上中线AM的长.2.在三角形ABC中,角A为60度,外接圆半径为4,求三角形ABC面积的最大值.