While underbalance drilling spreads greatly, rotating blowout preventer, as a kind of high technical product, is the crucial equipment to control well pressure.
It advocates get the dope is in the frist place.And inside they run a very cruel competitory mechanism.What is crucial is how much resource you can access.
It persists in the policy of 'Quality makes survivable, credit makes ascensive' and the management target of 'The quality is crucial, never let any flawy product circulates to clients '.
These case studies show that s mall subject vocabularies are useful for these community-oriented services, and that maintenance is a crucial issue for the development and use of the vocabular ies.