Researches on the safety of a hole, drilled eccentricly on round plate materials, are done by using an approximative method.

本文用近似方法对圆板偏心开孔的安全性作了探讨。

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Solves the problem of boundary value on an annular crack by using the nonlocal stress solution of an axisymmetric crack problem and approximative method of series expansion.

利用已得到的三维轴对称问题的非局部弹性应力的解，采用级数近似展开的方法，求解环状裂纹的边值问题。

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By use of the common formula for solving the time variations of the crustal density, the approximative plane formula is derived and its numerical calculation method is given.

采用求解地壳单层密度变化的一般公式，导出其平面近似公式并给出了相应的数值计算方法。

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