单项选择题
Which of the following is the correct signal flow for an analog multi-room audio system？（）
A.Source，Volume Control，Speaker，Amp B.Source，Amp，Volume Control，Speaker C.Amp，Source，Volume Control，Speaker D.Speaker，Amp，Volume Control，Source
单项选择题 WhichofthefollowingisthestandardaspectratioforHDTV？（）
单项选择题 Whichofthefollowingwouldbetheimpedanceofan8ohmanda4ohmspeakerthatarewiredinparallel？（）
单项选择题 Whichofthefollowingcancauseghostinginavideoimage？（）
