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Li Ming is so careful that he always looks over his exercises to ______ there are no mistakes.
1年前
It’s said that the president’s absence has _______ wide concerns and guesses.
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谨庠序之教,____________。(孟子《寡人之于国也》)
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顾吾念之,___________,徒以吾两人在也。___________,其势不俱生。(司马迁《廉颇蔺相如列传》)
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已知函数f(x)=cos(2x-2π/3)-cos2x(x属于r) 求函数f(x)的最小正周期及单调递增区间
1年前