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ѤҪԡ
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ʶԵ

: 4930797
й 31 ؤŷ ͹Ź
Ҥʻԧ PDF

spring constant

     繤ҤǷҡѵǹͧçʻԧ״˴ͤ˹˹ Ҥʻԧѹҡѹ Ѻ秢ͧʻԧ 繤Ҥ㹪ǧӡѴǧ˹ 觶ʻԧ١״͡ʹ֧Թǧ ʻԧѺ׹˹


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