单项选择题
Which of the following is a diplexer used for？（）
A.Allows two satellite tuners to use the same dish.
B.Connects the low noise block down converter （LNB） to the multi-switch.
C.Combines satellite and over the air （OTA） signals.
D.Allows one LNB to use two satellites.
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相关考题
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单项选择题
Whichofthefollowingistheprimarypurposeofimpedancematchedvolumecontrol？（）
A.Maintains proper speaker phase
B.Protects the amplifier from damage
C.Protects the digital systems from damage
D.Amplifies the speaker signal -
单项选择题
Thenativeresolutionfor1080iis（）
A.1920×1280
B.1920×1080
C.1280×1080
D.1280×720 -
单项选择题
Eachtimethedistancefromthespeakerisdoubled，volumedecreasesby（）.
A.3dB
B.6dB
C.12dB
D.24dB
