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1·These substantial evidences analysis includes following three aspects: First, this paper built one simultaneous equation model of Shanghai City commercial housing sales price.

这些实证分析包括以下三个方面：第一，建立了一个上海市住宅一级市场商品住宅价格联立方程模型。

2·The stiffness problem of differential equation set has been solved and a kinetic model of simultaneous pyrolysis reaction has been proposed.

解决了微分方程组的刚性问题，提出了混合裂解反应动力学模型。