The obstacles factors of soil were greater with longer greenhouse planting. Many ways were needed to solve the problems, including soil manage, fertilization, irrigation, farming policy, etc.
解决这一问题需要从土壤管理、施肥、灌溉、耕作、政策等多方面采取措施。
Based on introducing the working principles of the metal bar code, a method to manage drill string by planting metal bar code into the connection was developed.
结合柳湾煤矿开拓巷道 ，顺槽和综采工作面切割巷 ，采用锚网支护试验对金属网的作用机理进行重点研究。
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