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If one side of a triangle is 2 times of another side and it has the largest possible area, then the ratio of its three sides is
[     ]

A.
B.
C.
D.

  (英汉小词典:possible 可能的;area面积;ratio比率、比值)
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If one side of a triangle is 2 times of another side and it has the largest possible area,
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