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【单选题】
如果一个三角形的三边之比为2:2:3，那么这个三角形______．A.
一定有一个角是直角
B.
一定有一个角是钝角
C.
所有的角都是锐角
D.
三个角的大小不能确定
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A.
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A.
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B.
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A.
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B.
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C.
he looks very serious
D.
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