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(2011河北43题)The teachers ________ came for a visit are foreigners.
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(2018唐山路北区一模)At school, not only can we learn knowledge, but also enjoy ______ (color)life.
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如图,菱形ABCD中,∠B=60°,AB=4,则以AC为边长的正方形ACEF的周长为( ) A.14 B.15 C.16 D.17
1年前
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.
1年前