中正检测集团（简称OTC）,是合法从事检验、鉴定、测试、验货和认证的第三方服务机构，致力于商品供应链的质量鉴定和审核业务，专注于提供各个行业的质量解决方案。 Zhongzheng Group (OTC CHINA CERTIFICATE AND TESTING CENTER) is the lawful exercise of inspection, identification, testing, products inspection and certification third-party service agency. We are committed to quality appraisal, examination and verification business of the global commodity supply chain, and concentrate on providing quality sol..