短語詞組短語smooth wall blasting technique 光面爆破技術cushioned smooth face blasting 緩沖光面爆破smooth controlled blasting 光面控制爆破smooth hydraulic blasting 水壓光面爆破smooth surface blasting 光面爆破smooth -blasting rock layer 光爆層buffering smooth blasting 緩沖光面爆破smooth blasting excavation 光面爆破開挖 返回 smooth blasting