A.應(yīng)用層 B.連接層 C.MAC層 D.物理層
A.頻分復(fù)用Frequencydivisionmultiplexing B.碼分復(fù)用Codedivisionmultiplexing C.空分復(fù)用Spacedivisionmultiplexing D.時(shí)分復(fù)用Timedivisionmultiplexing