99re6在线视频精品免费,国产99re在线观看69热,久久91精品国产91久久||www.jiarun86.com

HH has DBS drilling rig training base including one set of advanced DBS training rig, hydraulic system teaching simulation operation platform, training classroom and other hardware facilities and professional training materials. It has provided training service for thousands of customer engineers from the Russia, the United States, Middle East and so on to make them capable in the fields of mechanical, electrical, drilling engineering and other aspects.