输出角
First, develop the forming model of ISDN from information angle, second, analysis the cost which is the basis of ISDN's tariff standard through determining the depreciation year of ISDN from input and output angle.
其次,从投入产出角度,通过对ISDN折旧年限的确定,对ISDN资费水平的基础&成本进行了分析。
纳米英语 · 双语娱乐资讯
纳米英语 · 四六级英语
纳米英语 · 双语新闻