When certifying a CAT5 cable installation the integrator must perform which of the following tests？（）

单项选择题Smallin-ceilingspeakersareBESTsuitedfor（）

A.loud， bass intensive music （e.g. heavy metal， rock）.
B.providing a sub-woofer for great bass reproduction.
C.background music and blending in with decor.
D.the user who wants perfect sound reproduction.

单项选择题WhichofthefollowingisthecorrectwiringorderforanRJ-11twolinejack？（）

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？（）

A.The sensor itself
B.The way the zones are wired
C.The zone type
D.The digital dialer

单项选择题WhichofthefollowingisaRFpeertopeermeshprotocolusedforlightingandotherresidentialelectronics？（）

A.Z-Wave
B.X10
C.CEBus
D.Wi-Fi

单项选择题WhichofthefollowingisMOSTlikelycausinganintermittentflashingLEDonanIRreceiverwhentheremotecontrolisnotbeingused？（）

A.The power supply is faulty and should be replaced.
B.The heat from a heating， ventilation， and air conditioning （HVAC） register is being received as infrared noise.
C.The radio frequency interference （RFI） is being received as noise.
D.A plasma display is emitting infrared noise.