导爆索的敷设应避免打结、擦伤破损,如必须交叉时,应用厚度不小于____的木质垫块隔开。导爆索平行敷设的间距不得小于____。()
A.100mm,200mm B.150mm,200mm C.200mm,250mm D.300mm,500mm正确答案A
导爆索的敷设应避免打结、擦伤破损,如必须交叉时,应用厚度不小于____的木质垫块隔开。导爆索平行敷设的间距不得小于____。()
A.100mm,200mm B.150mm,200mm C.200mm,250mm D.300mm,500mm正确答案A