参考例句:
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- 1. A model of nonartesian - artesian pumping well and new techniques water dam hole - well cleaning are put forward. 提出了无压 - 承压井抽水模式和“拦水坝”式冲孔洗井等新工艺. 来自互联网
- 2. A down - hole autotracking well pumping unit different from the conventional pumping unit was designed. 针对抽油技术的现状和存在的问题,设计了一种不同于有杆抽油方法的井下自动跟踪式抽油装置. 来自互联网
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