development drift
多平巷开拓系统 [矿业] multiple-entry system
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由于该巷道地质构造特殊，以6度斜坡向上开拓到800米后，还需继续向前平直开拓一段平巷，这就给提升造成很大困难。
As the geological structure of the roadway special, up to 6 degree slopes to open up to 800 meters, must continue to move straight to open up a Lane, which is very difficult to upgrade.
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