RG-6 coaxial cable is typically used in all of the following applications：（）
- A、multi-room audio， telephone， intercom and temperature control.
- B、thermostat， CCTV， smoke detectors and keypads.
- C、home theater， lighting control and multi-room audio.
- D、video， digital cable， and satellite applications.
正确答案:D
答案解析:有
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