septenary
1. Application in Engineering of Fire - extinguishing System of Septenary - Fluorine Propane
七氟丙烷灭火系统在工程中的应用
2. septenary notation
七进制记数法
3. septenary number
七进数
4. Computer Control of Low-velocity Septenary Continuous Rolling System
低速七连轧系统的计算机控制