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下列说法不正确的是( ) A.正多边形的各边都相等 B.各边都相等的多边形是正多边形 C.正三角形就是等边三角形 D.六条边都相等的六边形是正六边形
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The mother didn't know___________ is to blame for the broken glass as it happened while she was out.
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All of us have already known ____ she will choose is the opportunity to go abroad.
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有一根绳子,剪去60厘米,还剩20厘米,这根绳子原来长多少厘米?
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