A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/162062787478443e13c3a34054064ae563192f3c24432image13.png"style="width:106px;height:41px;"/>.
B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/16206278748163e76c5df6d6c4ee6beff1bf53676d541image14.png"style="width:118px;height:41px;"/>.
C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/16206278748566c31596550ca48dbb257f055b1a59921image15.png"style="width:105px;height:26px;"/>.
D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1620627874885068626b873444996a868a621e5f268c5image16.png"style="width:113px;height:26px;"/>.
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在点
处的法线方程为( ).