1. 如图制版，测量时发现数控之后有额外20dB衰减。如设置为0dB，则频谱仪测出-20dB；设置为16dB衰减，频谱仪测试为-36dB。请问这可能是什么问题？焊接问题还是程序问题。
2. 时序中DC是什么意思
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