According to time order and function, the evaluation methods are divided into early-evaluation, mid-evaluation and late-evaluation.
按评价时间先后分类，把评价方法分为早期评价、中期评价和后期评价。
Taking standard photos is its function. But I treat it as a mirror, in order to self-examine, and record at the same time.
标准照是其功能，而我却把它当镜子用，为了自我审视，同时记录。
Under the assumption that the demand function is fuzzy, the solving method for finding the optimal order time and quantity is given in this paper.
在时变需求函数具有模糊性的假设下，本文给出了最优订购时间和订购量的求解方法。
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