环空压降,annular pressure drop
annular friction drag环空压降损失
3)idle voltage drop空载压降
4)pumpdown抽空降压
5)air-pressure drop空气压降
6)reduce the pressure of environment环境降压
1.Constructing Eco-Compensation Mechanism can not only realize the values of ecology,reduce the pressure of environment,but also narrow the differences between areas,promote environmental construction in the sustainable development way and coincide with the principles of structuring the harmonious society.构建生态补偿机制,还原生态以价值,不仅是环境降压的出口,而且有利于缩小区际差距,促进环境建设走可持续发展的道路,同时也符合构建和谐社会的精神。
延伸阅读

环空压降损失分子式：CAS号：性质：又称环空摩耗或环空摩阻。在环形空间部分发生的压力损失。