I want to know the answer to the following question:
Companies such as Huawei, ZTE and Lenovo have built what in Nanjing?
All the background I'm provided with is that "Nanjing is an industrial technology research and development hub, hosting many R & D centers and institutions, especially in areas of electronics technology, information technology, computer software, biotechnology and pharmaceutical technology and new material technology.". Is that enough to answer the question?