单项选择题
Which of the following is MOST likely causing an intermittent flashing LED on an IR receiver when the remote control is not being used？（）
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.
相关考题
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单项选择题
Acustomernotifiestheintegratorthatthesystemkeypadreportstroubleatawindow.Uponinspection，thecustomerfindsthewindowclosedandlocked；thecustomerresetsthesystemanditfailstocorrecttheissue.Whichofthefollowingstepsshouldtheintegratortaketoresolvetheissue？（）
A.Check that the sensor is not misaligned.
B.Clean the space between the sensor and the plate.
C.Toggle the tamper switch to reset the sensor.
D.Bypass the zone. -
单项选择题
Wheninstallingasecuritysystem，whichofthefollowingconnectorswouldbeusedtoconnectthesecuritysystemtothetelephoneservicedemarcation？（）
A.RJ-31x
B.RJ-11
C.RS-232
D.DB-9 -
单项选择题
Whichofthefollowingdoesanastronomicaltimeclockdo？（）
A.Determines the ambient light at night with a photocell.
B.Calculates sunset and sunrise times based on geographical area.
C.Determines the start and end of each of the seasons.
D.Synchronizes the local time displayed with the official world time.
