| |||
冲击钻探〔孔〕 | |||
冲击钻探; 冲击打眼 | |||
冲击钻进钻头在一定装置作用下,利用钻具自重,在一定冲程高度内,周期性地对孔底进行冲击,以破碎岩石的钻进 | |||
冲击钻孔 | |||
撞钻; 冲击钻进; 冲击式钻探; 冲击钢索钻; 冲击钻採 |
percussion boring : 27 phrases in 7 subjects |
Bridge construction | 2 |
Drilling | 1 |
Ecology | 1 |
Engineering geology | 8 |
Oil / petroleum | 1 |
Technology | 13 |
Water resources | 1 |