单项选择题
Which of the following cabling would be MOST commonly used with digital volume controls？（）
A.Unshielded twisted pair B.RJ-59 C.16/4 solid conductors D.Speaker Wire
单项选择题 Whichofthefollowingisthecorrectsignalflowforananalogmulti-roomaudiosystem？（）
单项选择题 WhichofthefollowingisthestandardaspectratioforHDTV？（）
单项选择题 Whichofthefollowingwouldbetheimpedanceofan8ohmanda4ohmspeakerthatarewiredinparallel？（）
