This paper inserts grey system, makes use of finite time series, follows GM (1, 1) building method, builds the long term prediction model of total waste -water in Heilongjiang Province.
本文引入灰色系统理论，利用有限的时间序列，按照GM(1,1)建模方法，建立起黑龙江省污水总量长期预测模型。
This method can realizes active, real-time, long-term monitoring and is noticeable for its characteristics of cheap, practical and great maintainability.
这种结构混凝土监测方法具有实时、主动、长期监测的特点，且成本不高，易于维护，实用性较强。
During this term, you can learn the courses through courseware as long as you like instead of face-to-face teaching method with a limitation of only one-time attendance.
学习期内可不限时间、次数重复点播学习，打破了常规面授只能听一次的局限性；
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