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卡吉耶夫卡建井托拉斯“玛丽亚一深”矿井,在水平巷道掘进中为了确定使用大直径药卷的合理性,使用了直径32毫米和40毫米的药卷,使用的炸药是B－20阿莫尼特,起
In order to determine the rationale for the use of large-diameter coils in a horizontal tunneling process, Kajiyevka built the well-demarcated “Maria-Deep” mine shaft using 32 and 40 millimeter diameter coils using B-20 Armonet, starting