Chemicals used for treatment of water intended for human consumption - silver salts for intermittent use 人类生活用水处理化学药品.间歇性使用的银盐
2.
Chemicals used for treatment of water intended for human consumption - silver salts for intermittent use ; german version en 15030 : 2006 人类生活用水处理化学药品.间歇性使用的银盐