大学生一级毛片免费视频,久久婷婷国产综合日韩欧美,色婷婷精品二区蜜臀av,同性男男黄gay片免费

Hualong (Tianjin) test equipment manufacturing Co., Ltd. is located in Tianjin high-tech core area, is a professional engaged in railway highway, bridge, testing equipment research and development, production and sales of high-tech enterprises. Since its inception, after many years of development, has in the field of test instruments established good reputation, the company pays attention to lay a solid foundation for strength, attract a group of professional management, market and technical personnel, establish a modern enterprise management system, to talent oriented, integrity management, market-oriented, rely on Science and technology, to win the sustainable development as the basis for cooperation, lead the way in the laboratory equipment supply market, to the modernization, specialization, standardization and scale direction forward.

In recent years we to "pay attention to user needs to provide maximum convenience" as the enterprise mission, to broaden the scope of services, in addition to providing traditional railway highway bridge building materials testing instrument, for users provide supporting the supply of the full set of laboratory configuration scheme and test instrument, for users to build various Laboratory of choose and buy, use and complete after-sales service station.

Hualong (Tianjin) test equipment manufacturing Co., Ltd. welcome new and old customers to visit. Welcome to the industry to participate in the development of us.