A.0.5%B.0.4%C.0.3%D.0.2%
A.在儀器上部B.在儀器下部C.根據(jù)鉆具結(jié)構(gòu)決定D.由鉆井工程師決定
A.堵漏劑、玻璃球等大顆粒物質(zhì)B.重晶石C.粘土D.石墨