A.沖擊鉆井 B.旋轉(zhuǎn)鉆井 C.井下動(dòng)力鉆井 D.轉(zhuǎn)盤鉆井
A.經(jīng)濟(jì)B.安全C.發(fā)展D.主權(quán)
A.推動(dòng)B.發(fā)展C.支撐D.競(jìng)爭(zhēng)