a plane has two sides. haha.
本帖于 2010-07-15 15:50:56 时间, 由超管 论坛管理 编辑
回答: How dare you question geometric principle - 3 points define a pl
由 3-leg-man
于 2010-07-15 12:01:19
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回复:a plane has two sides. haha.
-3-leg-man-
♂
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07/15/2010 postreply
12:16:37