11. 兩個電壓時間函數v₁(t)與v₂(t)，若v₁(t)的相位超前v₂(t)為60 °，則下列何者正確？
(A) v₁ (t)=20 sin ( 314t–30 °)V、v₂ (t)=20cos(314 t– 60°)V
(B) v₁ (t)=20cos( 314t–60 °)V、v₂ (t)=20sin (314 t– 30°)V
(C) v₁ (t)=20sin( 314t–30 °)V、v₂ (t)=20sin (314 t– 60°)V
(D) v₁ (t)=20 cos(314 t–30 °)V、v₂ (t)=20sin (314 t– 60°)V

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