They can substitute AX sery DC welder.
是代替ax系列直流电焊机的最佳产品。
When a plate is simply supported at four edges, it can be solved by double sine sery method to get each proper frequency.
当板的四边为简支时可用双正弦级数解法来求得各阶固有频率。
When a plate is simply supported at four edges, it can be solved by double sine sery method to get each proper frequency.
当板的四边为简支时可用双正弦级数解法来求得各阶固有频率。
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