This paper introduces principle and influence factors in technology of perforation. 摘要本文对射孔技术的原理及影响因素进行了较为详尽的阐述。
The frame about our study is founded in this article, which includes the influence factors frame and the hiberarchy. 论文建立了城市公园景观设计的研究框架,该框架包括影响因素框架与层次框架。