1. Institute of Quality Standards and Testing Technology of BAAFS, No. 9 Middle Road of Shuguanghuayuan, Haidian District, Beijing 100097, China
2. Beijing Center of AGRI-Products Quality and Safety, No. 6 Middle Road of Yumin, Xicheng District, Beijing 100029, China
3. Beijing Changping Agricultural Technology Extension Station, Science and Technology Center Building, Fuxue Road, Changping District, Beijing 102200, China