8.如圖(5)所示之交流穩態電路,則電容電壓為何? (sin 36.9°=0.6及sin 53.1°=0.8) (A) 100∠-36.9°V (B) 100∠-53.1°V (C) 140∠53.1°V (D) 140∠-53.1°V