DuPont has offered the technology to fluoropolymer manufacturers globally in a royalty - free exchange.并且,杜邦已将这一技术免费提供给全球范围内的氟聚合物制造商.The preparation methods and materials such as ( fluoro - monomer ) and fluorosurfactant...
To all appearances this was done out of respect for the tutors.看上来全是尊师.Liam surprised his tutors by twice failing a second year exam.利亚姆两次都没能通过大二的一门考试，这让他的导师们很吃惊。The children's tutors were replaced by new teachers a...