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单项选择题

‍An amplifier has values of Pin = 20 mW and Pout = 60 W. What is the value of the power gain in dB for the circuit? ‌
‍‌

A．3000 dB
B．69.5 dB
C．34.8 dB
D．None of the above

问答题

系统的类型的作用：系统的类型数将决定系统有无_______。