题目内容:
深孔爆破是指()的炮孔爆破。
A.炮孔深度大于5m A.炮孔深度大于5m
A.炮孔深度大于5m
B.炮孔长度大于5m
B.炮孔长度大于5m
B.炮孔长度大于5m
C.炮孔直径小于50mm,炮孔深度大于5m
C.炮孔直径小于50mm,炮孔深度大于5m
C.炮孔直径小于50mm,炮孔深度大于5m
D.炮孔直径大于50mm,炮孔深度大于5m
D.炮孔直径大于50mm,炮孔深度大于5m
D.炮孔直径大于50mm,炮孔深度大于5m
参考答案:
答案解析: