搜索 - 科创

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引用第8楼jrcsh于2010-06-29 02:53发表的 : 一个人死了这些东西还与他有何干生命的结束 ~~~这前的一却与他无关已 .......人的价值并非在于自身，而在于他所处的社会...

Evanohm成分：Ni75/Cr20/Al 2.5/Cu 2.5 　可伐合金，英文：KOVAR；译文：可伐、科瓦（也称铁镍钴合金，相当于GB 4J29，ASTM F15，UNS K94610）；KO...

引用第7楼prcndssa于2011-03-27 23:30发表的 :发电厂是不是使用了并网调相装置？这个这个～电厂有个设备叫同期装置，是一面屏。正如LZ说的，以电网频率做基准，调节同步器改变汽...

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