单项选择题
When certifying a CAT5 cable installation the integrator must perform which of the following tests？（）
A.Measure Impedance B.Calculate Latency C.Measure Attenuation D.Measure Resistance
单项选择题 Smallin-ceilingspeakersareBESTsuitedfor（）
单项选择题 WhichofthefollowingisthecorrectwiringorderforanRJ-11twolinejack？（）
单项选择题 Whichofthefollowingdeterminesifthealarmshouldsoundoranentrydelayshouldstart？（）
