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Medium size grand piano with complete cast iron plate and very rigid rim made by many layers of hardwood.
中型钢琴完全铸铁板和非常严格环了许多层次的硬木。
Concentrating on the size, components and type of heavy and medium plate mill, the paper reveals some ideas about type selection of heavy and medium plate mill.
本文就中厚板轧机大小，组成及型式等三个问题，对中厚板轧机的选型和系列提出了一些看法。
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