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president 前面可以加the 若X＜0,x+y＞0 ,比较x,x+y,y,x-y ,y 五个数字的大小y-x 如果/x/ I am sure Mary has been here and _.A.did what required her B.has done what required her C.has done what was required of her D.did what has been required of her为啥选C啊 某国的总统用president of 还是the president of The woman,without a necklace around her neck,was a friend of Mary's.“The woman”和“without a necklace around her neck”是什么关系,中间有个逗号,是什么语法的运用呢?后面的was,为什么不用is. 请问The president of the board这是什么? the president of the class是啥意思?+英语 power of the American president 学校锅铲房原存有大小两堆煤,共重24吨,在小煤堆上又加入4吨,从大堆煤里用去四分之一后,两堆煤的重量相等,大小两堆煤原来各重多少吨? 代数式2分之X-1+X与X+2的值互为相反数,则X= The age of the selfie是什么意思 已知椭圆x^2/16+y^2/9=1,求其内接矩形周长的最大值,及此时矩形顶点坐标为什么会很敏感的设sin cos呢？题目里有什么信息吗 请问哪个发音比较好听 Charles Vincent Joseph Jame请问哪个发音比较好听Charles Vincent Joseph James Henry Martin Mark Bill Andy Alan Allen Gary Will 求椭圆x^2/a^2+y^2/b^2=1(a>b>0)的内接矩形的面积及周长的最大值 不用参数方程解 怎么解 英语老师怎样才能上好一节复习课? Lead Exposure什么意思The interaction of lead exposure and arylsulfatase A genotype affects sulfatide catabolism in human fibroblasts我刚开始看， the exposure of another madoffcreg 西域三十六国主要是哪几个国家? Who is the president of America now?A.George W·BushB.Washington.C.Bill Gates.D.Bill Clinton.各个英语爱好者,帮帮慧慧 不等数1/4（x-7）〈2/9-x 求正整数的个数 一艘过河的船,船头垂直于河岸行驶时,出发后10min到达出发点对岸下游120m处；若船头和对岸保持夹角为a行驶,经过12.5min后到达河对岸.求：⑴船在静水中的速度；⑵河宽；⑶夹角a. 英语翻译compared with almost twice this number in Northern Ireland and Scotland.twice this number in Northern Ireland and Scotland前面少了一个北爱尔兰和苏格兰的数值名词吧?应该是北爱尔兰和苏格兰是威尔士13% 的两 根据首字母填写单词：The judges a____ the first prize to her for her picture THE CASTLE PENGUIN MODERN CLASSICS怎么样 THE MOONSTONE MODERN LIBRARY CLASSICS怎么样 “西域内属,有三十六国”的主要原因是什么?【急】! Yet in so doing they will be getting the same level of exposure! THE RAINBOW MODERN LIBRARY CLASSICS怎么样 THE RAINBOW PENGUIN MODERN CLASSICS怎么样 THE MASTER AND MARGARITA MODERN CLASSICS怎么样 5个数前3个的平均数是x后两个的平均数是y,x和y的平均数是16.5它比五个数的平均数小0.5,问：x是（）y是（快答!