This paper refers to the concept of clean production and its back-ground and origin.
介绍清洁生产的概念及其产生的背景。
The origin and present situation of the ancient iron pagodas are described in this paper.
结构的动力特性是评价古塔抗震性能和损伤状态的重要指标。
The origin and present situation of the ancient iron pagodas are described in this paper.
结构的动力特性是评价古塔抗震性能和损伤状态的重要指标。
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