A.2dB B.3dB C.4dB D.5dB
A.網(wǎng)狀網(wǎng) B.環(huán)狀網(wǎng) C.星型網(wǎng) D.對(duì)等網(wǎng)
A.1/4 B.1/3 C.1/2 D.1/5