cdddd:频段 https://baike.baidu.com/item/%E9%A2%91%E6%AE%B5/10828844?fr=aladdin
XY&]T'A https://baike.baidu.com/item/%CE%B4/3300125?fr=aladdin
y$+!%y* http://www.hxen.com/yinbiao/zimu/2009-06-06/78759.html
[J[ysW})W http://www.cella.cn/zzzl/zs/03.htm
`Pz!SJ| 振动的基本概念
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(2020-11-13 09:44)
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