positive benching tunnelling method
... 台阶法 benching tunnelling method 正台阶法 positive benching tunnelling method 反台阶法 negative benching tunnelling method ...
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短语
正台阶法施工
Step method of construction
;
Construction Law are stairs
;
Positive step method of construction
正台阶回采法
heading-and-stope system
正台阶采煤法
heading-and-bench mining
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