错！！三脚架要比圆规稳定得多！！打回去复习物理课。

来源: π 于 2011-04-28 15:37:52 [旧帖] [给我悄悄话] 本文已被阅读：次

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错！！ 三脚架要比圆规稳定得多！！ 打回去复习物理课。