Subsequently , it creates good conditions for crop ' s growth , and increase the level of mechanization while decreases the total mechanical energy consumption 4 、由于较多地采用机械作业,保护性耕作的生产效率高于传统耕作,且劳动强度有所降低。
At present , the level of mechanization and automation of tunnel boring machines ( tbm ) has been improved significantly , and tbms can be designed to excavate tunnels with different shapes under different geological conditions 摘要目前,隧道掘进机的机械化及自动化水平得到了很大提高,隧道掘进机可以开挖不同的地质条件下各种形状的隧道。