小心，好像此题不简单，比“弹簧“要有内涵，不可类比。。。

来源: guest007 于 2010-10-18 05:18:28 [旧帖] [给我悄悄话] 本文已被阅读：次

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小心，好像此题不简单，比“弹簧“要有内涵， 不可类比。。。