谐振功率放大器与调谐放大器的区别是 ( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
设某谐振功率放大器工作在临界状态,已知电源电压Ec=36V,集电极电流导通角θ=70°,集电极电流的直流分量为100mA,谐振回路的谐振电阻Rc=200Ω,求放大器的输出功率Po,效率ηc?
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