单项选择题
A.应用层 B.连接层 C.MAC层 D.物理层
A.频分复用Frequencydivisionmultiplexing B.码分复用Codedivisionmultiplexing C.空分复用Spacedivisionmultiplexing D.时分复用Timedivisionmultiplexing
A.Band0到Band7 B.Band1到Band7 C.Band1到Band6 D.Band0到Band6