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土了，我想错了，你对的~~In Reply To:不是这种情况哈，见内 Posted by:richardxx at 2008-02-25 13:50:01 > A D > |\ /\ > | \ / \ > | \/ \ B > | C | > |--------+ > > 假如A和B的中点恰好在直线CD上.... Followed by:
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