单项选择题
A.Black，Green，Red，Yellow
B.Black，Red，Green，Yellow
C.Red，Black，Green，Yellow
D.Yellow，Red，Green，Black
单项选择题 Whichofthefollowingdeterminesifthealarmshouldsoundoranentrydelayshouldstart？（）
单项选择题 WhichofthefollowingisaRFpeertopeermeshprotocolusedforlightingandotherresidentialelectronics？（）
单项选择题 WhichofthefollowingisMOSTlikelycausinganintermittentflashingLEDonanIRreceiverwhentheremotecontrolisnotbeingused？（）