1. Because the good airtightness of our valve. 我这个底阀密封性能好。
2. Primary considerations were airtightness, thermal mass and high levels of insulation. 最初考虑的是气密性、热容量和高级隔热材料。
3. Airtightness as well as uniform electric field is of great importance to the stability of the electrolysis system. 密封性以及均匀电场对电解体系的稳定性十分重要。
4. A glass substrate convey airtightness box, including a lower box body, an upper boxing and an airtightness component. 一种玻璃基板运送气密箱，包括一下盒体、一上盒体及一气密构件。
5. Plastics piping systems. Thermoplastics piping systems for soil and waste discharge. Test method for airtightness of joints. 塑料管道系统。土壤和废料排出用热塑管道系统。粘接处密封度试验方法。
