Add 　Balizhuang Road Chaoyang District Beijing P.R.C. 　Post 　100025 　Tel 　0086-10-65562859 　Fax 　0086-10-65560506 　website 　http://www.btei.cn 　E-mail 　btei@btei.cn

Add: Balizhuang Road Chaoyang District Beijing 100025 P.R.C. Tel: 0086-10-65562859/60 Fax:0086-10-65560506 http://www.btei.cn E-mail: btei@btei.cn