计算曲面积分 <img src="https://static.zxtiku.com/wangke/imgs/topic/26dca8b936ac3253224436aea38a7f63.jpg"/> , 其中 <img src="https://static.zxtiku.com/wangke/imgs/topic/af54e1f10bf37abcec8d114321f4480e.jpg"/> 是曲面 <img src="https://static.zxtiku.com/wangke/imgs/topic/0ba9d65d9966f9285cd8aebeb94a4263.jpg"/>，取上侧。<br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/b581324041fe04d835b586d9263783c1.jpg"/><br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/ce30ccc3a11a164224bf53001e72b960.jpg"/><br/> C、0<br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/9bbf609246e98a2a17649b4c7d1ca532.jpg"/>