A twinning agreement between Chinese metropolis Shenzhen and Bulgarian city of Plovdiv, as well as seven more bilateral business contracts were signed here on Monday during a cooperation forum. Some 60 Chinese companies and 40 potential counterparts from Bulgaria participated in the event titled "Plovdiv--Shenzhen Investment and Cooperation Conference", organized by the two municipalities, Bulgarian-Chinese Business Development Association (BCBDA) and China Council for the Promotion of International Trade at Shenzhen Council, together with the Chinese embassy in Bulgaria. "We will make all-round cooperation with Plovdiv, in fields of electronic and information, biological husbandry, fine mechanics, as well as the cooperation in cultural, educational, sport and health programs," said Xu Qin, Mayor of Shenzhen in an interview with Xinhua after the twinning ceremony. "The cooperation between cities will carry out the strategies for national cooperation through concrete industry projects," he added. Five companies from Shenzhen signed agreements with seven Bulgarian firms. Huawei Technologies Bulgaria signed an agreement with Sienit Holding for joint development of an intelligent industrial park. BGI and Genic Laboratory will cooperate in noninvasive prenatal gene test and neonatal examination. Mindray signed with Dutchmed International EOOD and Infinita for sole agency of its medical appliances. "The cooperation with Sienit Holding will focus on the intelligent IT solution for the industrial park. We will provide modern and convenient IT solution for the companies in the industrial park, including the Cloud Storage, computing center, overall communication network," said Liu Yang, manager director of Huawei Technologies Bulgaria. "Although much has been done to represent Bulgaria in China, there are still huge opportunities and still much work is required on promoting our country, our business, our companies, the opportunities for investment by Chinese companies in Bulgaria," Plamen Panchev, Board Chairman of Sienit Holding and a founder of BCBDA told Xinhua.