单项选择题
Which of the following is the primary purpose of impedance matched volume control？（）
A.Maintains proper speaker phase
B.Protects the amplifier from damage
C.Protects the digital systems from damage
D.Amplifies the speaker signal
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相关考题
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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 -
单项选择题
AccordingtoOhm’sLaw，whichofthefollowingiscorrect？（）
A.As voltage increases， resistance decreases
B.As amperage decreases， resistance decreases
C.As resistance decreases， amperage increases
D.As resistance increases， voltage increases
