摘要：
pH value
For thousands of years people have known that vinegar, lemon juice and many other food taste sour. However, it was not until a few hundred years ago that it was discovered why these ...
摘要：
Oeko-Tex Standard 100生态纺织品认证——通向国际市场的绿色通行证
Oeko-Tex Standard 100是世界上最权威的、影响最广的生态纺织品标签。截止到2006年12月，Oeko-Tex证书已经遍布全球80多个国家和地区，上百万种纺织产品获得Oeko-Tex Standard 100认证标签标示的权利。Oeko-Tex Standard 100现在共有20...
