Bill Lacey of the South African Chamber of Business worries that this places a heavy burden on small firms.
南非商会的比尔担心这会给那些小公司带来很重的负担。
Rock joint has a strong influence on blasting result, when burden and fault are parallel, this easily results in rushing out of the chamber and partition wall.
岩体结构面对爆破效果有显著影响，当最小抵抗线与结构面平行时，极易造成冲炮和隔墙。
Rock joint has a strong influence on blasting result, when burden and fault are parallel, this easily results in rushing out of the chamber and partition wall.
岩体结构面对爆破效果有显著影响，当最小抵抗线与结构面平行时，极易造成冲炮和隔墙。
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