国际电信联盟严格界定了信息产业的范畴有哪些()?
A、电信服务与设备
B、计算机服务与设备
C、声音与图像传播及其设备
D、音像娱乐业
参考答案:A, B, C, D
--- A homeless man won a lottery ticket. He became rich over night.
--- ___________________
A.Better safe than sorry.
B.The early bird catches the worm.
C.Too many cooks spoil the broth.
D.Every dog has its day.
现场总线通信方式和模拟通信方式的不同点?