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六七十年代,我国生产的提升机只能满足井深600～700m、3m~3以下的小吊桶提升。随着井筒掘进机械化的提高,这些提升机逐渐暴露
In the 1960s and 1970s, the hoisting machine produced in our country only met the requirements for lifting small buckets of 600 ~ 700m and 3 ~ 3 below the well depth. As borehole mechanization improved, these hoists were gradually exposed