shaft development的意思|示意

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shaft development相关短语

1、 vertical shaft development 立井开拓

2、 inclined shaft development 斜井开拓

3、 vertieal shaft development 立井开拓

4、 blind shaft development 盲竖井开拓

5、 special shaft development 特殊凿井

6、 horizontal shaft development 平硐开拓

7、 vertical shaft development system 竖井开拓

8、 development of vertical shaft 竖井掘进