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对木兰解甲归来,有以下几种看法,你认为哪些最有道理? [ ]
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Dear students,please read every sentence carefully.______ you are,______ mistakes you'll make.
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One afternoon I toured an art museum while waiting for my husband to finish a business meeting.
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平面内有n条直线,其中无任何两条平行,也无任何三条共点,求证:这n条直线把平面分割成1/ 2 (n^2+n+2)块.
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