单项选择题
RG-6 coaxial cable is typically used in all of the following applications：（）
A.multi-room audio， telephone， intercom and temperature control. B.thermostat， CCTV， smoke detectors and keypads. C.home theater， lighting control and multi-room audio. D.video， digital cable， and satellite applications.
单项选择题 Whichofthefollowingcommunicationmethodswillprovidethemaximumbandwidthforvideostreamingthroughamediaextender？（）
单项选择题 WhichofthefollowingvideooutputsfromamediaPCprovidetheBESTpicturequality，whenconnectingthemediaPCtoaprojector？（）
单项选择题 Anopticalcableisusedtotransmit：（）
