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.
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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