作为算例计算了四边简支菱形板的自振频率和临界载荷。
The critical load and natural frequency of rhombus plates with simply supported at all edges are calculated.
墙砖，正方形，浇铸，黑色、灰色、浮雕装饰，几何设计，包括花朵，叶形的装饰板，菱形，大的设计图局部。
Wall tile, square, molded, black and gray, raised line decoration, geometric design including flowers, acanthus leaves, and diamonds, part of a larger design.
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