A.2mm B.4mm C.6mm D.8mm
A.5%~10% B.10%~15% C.15%~20% D.20%~30%
A.鉆井液盤根壓帽及接頭 B.渦輪鉆具轉(zhuǎn)子螺帽及接頭 C.鉆桿及鉆鋌的連接 D.鉆鋌及鉆頭的連接