短语词组短語casing -head 套琯頭casing screw head 套琯母釦護絲casing drive head 套琯帽casing g head 套琯頭casing circulating head 套琯循環接頭Humate additive for casing -head mud 腐殖酸鑽井泥漿添加劑cement casing head 水泥頭;注水泥套琯頭 返回 casing head