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对于多层房子来说，影响地震作用有两个因素：一个是质量，我 们已经得到了每个振型的质量；另一个则是高度
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owner: bian222 - (no access) - 地震力是怎么算出来的111.pdf, p68


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statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

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