题目内容

若载波uC(t)=UCcosωCt,调制信号uΩ(t)=UΩcosΩt,则普通调幅波的表达式为().

A. uAM(t)=UCcos(ωCt+masinΩt)
B. uAM(t)=UCcos(ωCt+macosΩt)
C. uAM(t)=UC(1+macosΩt)cosωCt
D. uAM(t)=kUΩUCcosωCtcosΩt

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