Visitors take photos of a Mach PHREV transmission in Beijing on March 30. Dongfeng Motor unveiled its plug-in hybrid range-extended Mach technology in Beijing on Saturday night, presenting the State-owned automaker's efficient electric drive. You Zheng, deputy general manager of Dongfeng Motor, said models equipped with the Mach PHREV combine the advantages of pure electric, range-extended and plug-in hybrid technologies, …