管用钻孔攻丝复合刀具
combined pipe tap and drill
扩铰复合刀具
combined core drill and reamer
钻孔扩孔
bore hole drilling and enlarging
介微孔复合孔道
Micro-mesoporous composite structure
镶齿锥管丝锥
inserted blade taper pipe tap
真丝复合丝加工技术
compound silk processing technology
STR复合扩增
STR multiplex amplification
定向钻扩孔
reaming operation in directional drilling