29.承上題,v_L(t)的穩態解為何?
(A) v_L =13.4 cos(100t +48°) V
(B) v_L =12.4cos(100t +43°) V
(C) v_L =11.4cos(100t +38°) V
(D) v_L =10.4cos(100t +33°) V

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