Analysis of reason about the squib of front screen superheater of No.2 boiler at the power plant provided for oneself of WISCO
武钢自备电厂2~锅炉前屏过热器爆管原因分析
The result is, in the Qing Dynasty, the structure of natural economy ( Provide for oneself) has local breakthrough, farmers began to enter the field of grain production, especially in tea plant, the tea production technology has been improved to some extent.
得出以下认识:清代福建自给自足的自然经济结构有所突破,农民开始向粮食生产以外的领域进军,尤其是茶叶种植,有种植茶叶的兼营户,还有专业户,茶叶生产技术也得到一定程度的提高。
英语网 · 双语娱乐资讯
英语网 · 英语口语
英语网 · 初中英语作文
英语网 · 双语新闻