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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单项选择题

The native resolution for 1080i is（）

A.1920×1280
B.1920×1080
C.1280×1080
D.1280×720

单项选择题

Each time the distance from the speaker is doubled， volume decreases by（）.

A.3dB
B.6dB
C.12dB
D.24dB

单项选择题

According to Ohm’s Law， which of the following is correct？（）

A.As voltage increases， resistance decreases
B.As amperage decreases， resistance decreases
C.As resistance decreases， amperage increases
D.As resistance increases， voltage increases