比表面测定仪 BSD-A 贝士德仪器科技（北京）有限公司

p1Src=//y1.yzimgs.com/uploads_old/312087/2008062409010468_Old.jpg&p2Src=//y1.yzimgs.com/uploads_old/312087/2008062409010468_old_1.jpg&p3Src=//y1.yzimgs.com/uploads_old/312087/2008062409010468_old_2.jpg"

aa