The following points were emphasized: the hollow structure of core can improve yieldability and reduce the shrinkage stress;
主要强调以下几:提高型芯的退让性,以减小收缩应力,将芯子做成中空结构效明显;
The following points were emphasized: the hollow structure of core can improve yieldability and reduce the shrinkage stress;
主要强调以下几:提高型芯的退让性,以减小收缩应力,将芯子做成中空结构效明显;
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