What are the subsidiaries in Tsinghua University?
Tsinghua University's school-run enterprises include Tsinghua Holding Co., Ltd., Tsinghua Tongli Company (subordinate enterprises include Tsinghua University Equipment and Instrument Factory, Science and Education Instrument Factory, Printing Factory and other school-run factories), Ziguang Co., Ltd., Tsinghua Tongfang Co., Ltd., Chengzhi Co., Ltd., Ziguang Guhan Biopharmaceutical Co., Ltd., etc. But now, except Tsinghua Holding Co., Ltd., others are not allowed to be called "Tsinghua".