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

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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

单项选择题

When configuring surround sound systems， speaker delay is used to compensate for speaker（）.

A.distance
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B.Contains two wires in a red fireproof jacket
C.Contains four twisted pairs of wires
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