国家对电信终端设备、无线电通信设备和涉及网间互联的设备实行（）。
A、标准接口制度
B、进网许可制度
C、统一指标
D、合作制度
参考答案：B
When we get together, we always have a great time ____ to each other. We usually talk about something
interesting. [ ]
A. saying
B. telling
C. talking
D. laughing
胶团催化机理
