Wanlong Optoelectronics is the largest enterprise in China

This sentence is wrong.

According to Qichacha, Hangzhou Wanlong Optoelectronic Equipment Co., Ltd.’s main business is the research and development, production and sales of cable TV network equipment, including amplifiers, branch distributors, connectors, and optical transmitters. , optical receivers, optical workstations, etc. Hangzhou Wanlong Optoelectronic Equipment Co., Ltd. is one of the largest companies in China, but it is not the only one.