• 2022-05-27
    随机变量服从泊松分布[img=64x21]17e0c3518c476d4.png[/img],则[img=81x21]17e0c3553b71aed.png[/img]等于( )
    未知类型:{'options': ['', ' [img=21x19]17e0aaf44e54286.png[/img]', ' 16', ' 19'], 'type': 102}