单项选择题

Whenconfiguringsurroundsoundsystems，speakerdelayisusedtocompensateforspeaker（）.

A.distance
B.power
C.size
D.efficiency
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Whichofthefollowingisadiplexerusedfor？（）
A.Allowstwosatellitetunerstousethesamedish.
B.Connectsthelownoiseblockdownconverter（LNB）tothemulti-switch.
C.Combinessatelliteandovertheair（OTA）signals.
D.AllowsoneLNBtousetwosatellites.
单项选择题
WhichofthefollowingBESTdescribesCAT5e？（）
A.Containsfourpairofwiresofvariousgauge
B.Containstwowiresinaredfireproofjacket
C.Containsfourtwistedpairsofwires
D.Containseightwireswithinathickjacketwitharipcord
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