系统回损测试应该在Site Master仪表上MODE中选择以下哪一种？（）A、DTF-SWRB、FREQ-CABLE LOSSC、DTF-RETURN LOSSD、FREQ-RETURN LOSS
系统回损测试应该在Site Master仪表上MODE中选择以下哪一种？（）
- A、DTF-SWR
- B、FREQ-CABLE LOSS
- C、DTF-RETURN LOSS
- D、FREQ-RETURN LOSS
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