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英语
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Tom is looking (at,for)his keys,but he cannot find them.
人气：447 ℃ 时间：2019-09-27 15:56:23
解答
Tom is looking for his keys,but he cannot find them.
look for sth.寻找
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■■三道初三化学题【2道选择1道填空】■■
如图，有一个抛物线型拱桥，其最大高度为16m，跨度为40m，现把它的示意图放在平面直角坐标系中，则此抛物线的函数关系式为_．
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