所有测试数据直接显示，无需二次计算。

All test data are directly displayed. No calculation is needed.

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取作为二次微商计算式。

We take as the second derivative formula.

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计算中未发现有二次塑性区。

No secondary plastic zone was found.

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该方法优点是计算简单，只需要解一些二次方程组。

The method is simple for computation, and it only needs to solve some equations.

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该方法优点是计算简单，只需要解一些二次方程组。

The method is simple for computation, and it only needs to solve some equations.

youdao