不管螺帽裏麵怎麽個機構，牛頓定律說要使螺帽動起來還得靠外力

來源: 競選於 2010-03-02 12:34:44 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.