已知i<sub>1</sub>（t）=9<img src="/Image1/96/96cb75e30efeac484423dd208b1f542e.jpg" />sin314tA， i<sub>2</sub>（t） =6<img src="/Image1/96/96cb75e30efeac484423dd208b1f542e.jpg" />sin（314t－60°）A，则i<sub>1</sub>与i<sub>2</sub>的相位关系是（）<br>A:i<sub>1</sub>超前i<sub>2</sub><br>B:i<sub>1</sub>滞后i<sub>2</sub><br>C:i<sub>1</sub>与i<sub>2</sub>同向<br>D:i<sub>1</sub>与 i<sub>2</sub>反向