A.復(fù)接和線路傳輸 B.線路傳輸和交換 C.復(fù)接和交換 D.復(fù)接、線路傳輸及交換
A.微波傳輸 B.衛(wèi)星傳輸 C.微波和衛(wèi)星傳輸 D.以上都不對(duì)
A.1.5Mbit/s和2Mbit/s B.2Mbit/s和8bit/s C.1.5Mbit/s和8bit/s D.1.5Mbit/s和34bit/s