皮皮学，免费搜题
登录
搜题
【简答题】
设二维随机变量(X，Y)的联合分布律为P{X=i，Y=j}=(i+j)p(i=0，1，2，j=0，1)，求常数p与概率，P{XY=0}．
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Why do we call the sun'a life－giving star'?A． Because it gives us warmth．B． Because
A.
25． Why do we call the sun'a life-giving star'? A． Because it gives us warmth．
B.
Because there are some living things on it．
C.
Because plants and animals can't live without it．
D.
Because people have to live in the dark without it．
【单选题】A long-term study of 136 pairs of twins showed that ______.
A.
they lost a little ability to reason over the years
B.
the only factor which declined over the years was their speed with which to perform. mental tasks
C.
their memory was not as good as it had once been
D.
their minds became a bit more active as they grew older
【单选题】以下属于As型的鼓室图特点是（）
A.
钟形，峰压出现在-100至+100daPa范围内，声导抗值在0.3~1.6mL
B.
平缓，声导抗值小于0.3mL，在鼓室积液或耵聍栓塞或穿孔时引出
C.
钟形，峰压出现在-100daPa以下，导抗正常，为咽鼓管功能障碍时引出
D.
钟形，峰压在正常范围内，声导抗值大于1.6mL，多见于鼓膜愈合形穿孔
E.
钟形，峰压在正常范围内，声导抗值小于0.3mL，多见于镫骨固定
【单选题】别构酶的动力学特点是
A.
υ对［S］作图呈抛物线形
B.
υ对［S］作图呈S形
C.
υ对［S］作图呈钟形
D.
初速度对［S］关系符合米氏方程
E.
不受调节物质的影响
【单选题】The term 'The 'Lost Generation' mainly refers to the American generation of young people after ______.
A.
WWI
B.
WWII
C.
the Civil War
D.
the Vietnam War
相关题目：