同义词
1)protection casing,护壁套管2)casing pipe protection,套管护壁3)the hole wall protection method with casing,套管护壁法4)steel sleeve wall protection,钢套管护壁5)bilateral double-pipe protecting borehole wall blasting,双侧套管护壁6)unilateral double-pipe protecting borehole wall blasting,单侧套管护壁
