A . A、f1(t)*f2(t)←→F1(jω)F2(jω)B . B、f1(t)+f2(t)←→F1(jω)F2(jω)C . C、f1(t)f2(t)←→F1(jω)F2(jω)D . D、f1(t)/f2(t)←→F1(jω)/F2(jω)
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