通过首次提出了带经济器螺杆制冷机的中间温度的拟合方程式，计算结果与试验结果吻合良好。

The equation of the medium temperature is correlated. Compared with the experiment data, the calculating results are agreement well with the experiment ones.

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首次选取泰勒级数的部分二次项，用一个距原点最近点处拟合的超低维曲面近似极限状态面。

Firstly part of quadratic term of Taylor series is chosen; a low-dimension surface is used to approximate limit state surface; and the modified reliability formula is derived.

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首次选取泰勒级数的部分二次项，用一个距原点最近点处拟合的超低维曲面近似极限状态面。

Firstly part of quadratic term of Taylor series is chosen; a low-dimension surface is used to approximate limit state surface; and the modified reliability formula is derived.

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