By how much is a signal’s strength reduced when the signal passes through an object thatintroduces 3 dB of attenuation？（）
- A、1/6
- B、1/4
- C、1/3
- D、1/2
正确答案:D
答案解析:有
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By how much is a signal’s strength reduced when the signal passes through an object thatintroduces 3 dB of attenuation？（）
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