钻孔扩孔
bore hole drilling and enlarging
套式扩-铰刀刀柄
tool shank for shell core drill and reamer
车载式钻孔架
truck mounted drilling rig
分量式钻孔应变
Componential-type borehole strain
component borehole strain
分量式钻孔应变仪
component borehole strainmeter
改良式钻孔引流
Improved trepanation and drainage
体积式钻孔应变仪
volume borehole strain meter