In this paper, three cases are listed where the triable calculation met-hod is used for designing metallurgical machinery.

本文搜集冶金设备设计计算中，若干使用试差法的场合，共三款。

Finally, according to the result of the theoretical analysis, a series of triable advice for the experimental county is given.

最后根据理论分析的结果，对试点县提出了一系列可操作性的建议。