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本文通过对荣华二采区10...
利用群系的观点研究了πσ-幂类群类，并给出了它的一个充要条件。文中群指有限群，所有符号及术语见文献2。......
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对几种淡水贝（包括蚌、螺）进行形态及组织学观察，并通过实验方法重现贝壳三种物质，即：角质、棱柱质、珍珠质的生成过程，结果表明：外套膜外......
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