中性点不接地电网，发生单相接地时，故障线路始端的零序电流<img src="/Image1/2c/2cb589dd573312f20d697c2491c952e3.jpg" />与零序电压<img src="/Image1/2c/2cb589dd573312f20d697c2491c952e3.jpg" />的相位关系是（）。<br>A:3<img src="/Image1/95/9529b6db9e54d81a5c5f650b3d797db9.jpg" />超前3<img src="/Image1/2c/2cb589dd573312f20d697c2491c952e3.jpg" />90°； <br>B:3<img src="/Image1/95/9529b6db9e54d81a5c5f650b3d797db9.jpg" />滞后3<img src="/Image1/2c/2cb589dd573312f20d697c2491c952e3.jpg" />90°； <br>C:3<img src="/Image1/95/9529b6db9e54d81a5c5f650b3d797db9.jpg" />超前3<img src="/Image1/2c/2cb589dd573312f20d697c2491c952e3.jpg" />110°； <br>D:3<img src="/Image1/95/9529b6db9e54d81a5c5f650b3d797db9.jpg" />滞后3<img src="/Image1/2c/2cb589dd573312f20d697c2491c952e3.jpg" />110°。