二次群的英文

quadratic group

secondary block

secondary group

• 二次:    secondary; quadrat ...
• 群:    crowd; group
• 第二次群聚:    secondary aggregat ...

例句与用法

1. Performance and test methods of the second order digital multiplex equipment operating at 8448 kbit s and using positive justification
   8448 kbit s正码速调整二次群数字复用设备技术要求和测试方法