In this paper, the GM (1, 1) model based on the Gree Theory is used to predict the brick exchange period of cement kiln, and the available result is satisfactory.
本文利用灰色理论的GM(1,1)模型，对水泥回转窑换砖周期进行预测，取得了满意结果。
Then use SWOT model to analyze the advantage in the trade of Gree air conditioner and inferior position, chance and threat, have defined the position of Gree air conditioner in the trade competition.
接着运用SWOT模型分析了格力空调的在行业中的优势与劣势，机会与威胁，进而明确了格力空调在行业竞争中的地位。
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