centre crust breaking 中部打壳 ; 中心打壳

mechanical crust breaking 机械打壳

outside crust breaking 四周打壳

crust breaking hammer carrier 打壳锤架

manual crust breaking 人工打壳

crust breaking hammer 打壳锤

crust breaking cycle 打壳周期

crust breaking chisel 打壳锤头

crust breaking chips 电解槽打壳锤头 ; 打壳锤头