If necessary, provide a wider base by putting the fulcrum on a board that will spread the load on the ground.
如有必要，可将支点下放置一块垫板，以增加受力面积，将负载分散到地面。
With increase in electronic package density, the reliability of a board-level package under drop impact load becomes a key issue.
随着微电子封装密度的提高，板级封装在跌落冲击载荷下的可靠性成为人们关注的焦点。
In the meantime, through a large quantity of cement concrete pavement stress calculation, the paper puts forward relation expression between load on concrete board and stress level under board;
同时，通过大量的水泥混凝土板底应力计算，推导出了混凝土面板荷载与板底应力水平的关系式；
In the meantime, through a large quantity of cement concrete pavement stress calculation, the paper puts forward relation expression between load on concrete board and stress level under board;
同时，通过大量的水泥混凝土板底应力计算，推导出了混凝土面板荷载与板底应力水平的关系式；
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