Compared with the conventional methods, this new, technique has very conspicuous virtues such as a much better working condition, safety in ope - ration, economy of timbers.
这种工艺与常规的浅眼爆破法掘进天井比较，具有非常突出的优点：工作条件得到改善，安全，可以节约大量坑木。
Compared with the conventional methods, this new, technique has very conspicuous virtues such as a much better working condition, safety in ope - ration, economy of timbers.
这种工艺与常规的浅眼爆破法掘进天井比较，具有非常突出的优点：工作条件得到改善，安全，可以节约大量坑木。
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