设(X,Y)服从抛物线<img src="https://static.zxtiku.com/wangke/imgs/topic/ee9f22b9ff047f004ec7e7ecbb304194.jpg"/>和直线<img src="https://static.zxtiku.com/wangke/imgs/topic/c0134202726dcaa12b98617ce1bea46a.jpg"/>所夹的区域G上的均匀分布，则边缘密度为_______。<br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/328539fdfcbca4193560c0010808d2bc.jpg"/>，对所有的x,y<br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/7b4e2a02b1e578ae200d026559dabf87.jpg"/><img src="https://static.zxtiku.com/wangke/imgs/topic/a72f7528ff2e7284c168947e99ca349b.jpg"/>其它情况均为0<br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/f1e74a212e5902a17a4b9c51a72cc52d.jpg"/>,其它情况均为0<br/> D、都不对