A.5MHz B.1.6MHz C.3.84Mcps D.1.28Mcps
A.物理層 B.數(shù)據(jù)鏈路層 C.網(wǎng)絡(luò)層 D.IP層
A.乒乓切換 B.軟切換 C.硬切換 D.更軟切換