Qingdao Chinaoil Co., Ltd. is one of the key members of Petro-China Co., Ltd. Which is an extra large enterprise in China, and is also a subsidiary of China National United Oil Co., Ltd. taking \"Credibility and Initiative\" as enterprise culture, this company kept showing great stride in import &export trade and domestic trade, and got increasing benefit since its foundation. With improving inner management and quality service, this company has passed the certificate of ISO9001: 2000 quality management system by China Import and Export Quality Certificate Center. Presently this company is...