单项选择题

AccordingtoOhm’sLaw，whichofthefollowingiscorrect？（）

A.Asvoltageincreases，resistancedecreases
B.Asamperagedecreases，resistancedecreases
C.Asresistancedecreases，amperageincreases
D.Asresistanceincreases，voltageincreases

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单项选择题

Whenconfiguringsurroundsoundsystems，speakerdelayisusedtocompensateforspeaker（）.

A.distance
B.power
C.size
D.efficiency

单项选择题

Whichofthefollowingisadiplexerusedfor？（）

A.Allowstwosatellitetunerstousethesamedish.
B.Connectsthelownoiseblockdownconverter（LNB）tothemulti-switch.
C.Combinessatelliteandovertheair（OTA）signals.
D.AllowsoneLNBtousetwosatellites.