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2012年福州中考题第21题
Author:
王俊辉
拖动参数d，改变其大小，观察线段PQ中点M的轨迹追踪。题目参见：
http://user.qzone.qq.com/774869818/infocenter#!app=2&via=QZ.HashRefresh&pos=1374558535
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