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In 1907, Anna Jarvis began a movement to convince lawmakers to set a special day to honor America’s mothers. Many states......
研究了单板厚度和配置方式对复合定向刨花板性能的影响。试验发现:1.复反的强度与刚度随着单板配置方向的改变而明显改变。当单板纹理......