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填空题天麻中( )有对神经细胞损伤的保护作用,还有抗自由基和保护细胞膜作用

生药学课程封面

学科：生药学

时间：2023-12-13 12:40:16

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已知离散型随机变量<img src="https://tihai-oss-cloud.itihey.com/img/e22a13f7edcffe98b7a922d3fe5be3b8.png">的分布律为<img src="https://tihai-oss-cloud.itihey.com/img/ea35e65aff8133c2c2da392b08c643e4.png">,且<img src="https://tihai-oss-cloud.itihey.com/img/784ddd09ffb0ac2f95275af4f57b2df5.png">的,则<img src="https://tihai-oss-cloud.itihey.com/img/df38fcaa818086239a028beee806e06b.png">为( )

A. 0.5B. 0.25C. 1D. 0.75

设二维随机变量(X,Y)的联合概率密度函数为<img src="https://tihai-oss-cloud.itihey.com/img/dc256d79e08cb51cfc75c8b091bce4cf.png">,则P{X+Y<2}=( )

A. 1/2B. 1/4C. 1D. 2/3

设二维随机变量(X,Y)的分布函数为<img src="https://tihai-oss-cloud.itihey.com/img/628a94b6afa3d7b780381cbc129c406e.png">,-∞<x<+∞,-∞<y<+∞,则参数A=( )

A. <img src="https://tihai-oss-cloud.itihey.com/img/d8d757cb70d79fa9469894ca2a246435.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/0a6cc51a22a64aa9ad13f72c3bfbe26f.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/a2bf78b86183aaa60dabf18a3d0df9c6.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/5a9263666608cb2c1ef366899a9185a2.png">

设二维随机变量(X,Y)的联合分布律为<img src="https://tihai-oss-cloud.itihey.com/img/231fe8e7f801a58b916bff5ac4bd9b4c.jpg">,则P{X=0}=( )

A. 0.7B. 0.4C. 0.3D. 0.6

已知离散型随机变量(X,Y)的分布律为<img src="https://tihai-oss-cloud.itihey.com/img/9557ff5e1dcc46e6ae857efac16c5237.png">,则 P{2≤X≤3,1<Y≤2}为( )

A. 0.125B. 0.375C. 0.5D. 0.625

设二维随机变量(X,Y)的联合概率密度函数为<img src="https://tihai-oss-cloud.itihey.com/img/b8f883d7cf5e27eac07dd01f17a93d69.png">,则P{X>Y}=( )

A. 2/5B. 4/5C. 3/5D. 1/5

已知离散型随机变量<img src="https://tihai-oss-cloud.itihey.com/img/e22a13f7edcffe98b7a922d3fe5be3b8.png">的分布律为<img src="https://tihai-oss-cloud.itihey.com/img/ea35e65aff8133c2c2da392b08c643e4.png">且 <img src="https://tihai-oss-cloud.itihey.com/img/c31276924e707acab741ad2dbb43277e.png">,则<img src="https://tihai-oss-cloud.itihey.com/img/03e13c03f211e99c8562606bc1606af3.png">为( )

A. 0.75B. 0.25C. 1D. 0.5

已知离散型随机变量<img src="https://tihai-oss-cloud.itihey.com/img/e22a13f7edcffe98b7a922d3fe5be3b8.png">的分布律为<img src="https://tihai-oss-cloud.itihey.com/img/63039e43e8288979264007cdffae59be.png">,且<img src="https://tihai-oss-cloud.itihey.com/img/cce94e085627cc2f0f76cd1ae56432ee.png">,则<img src="https://tihai-oss-cloud.itihey.com/img/e92e9f4d33a51e1283c192baf812ee9a.png">为( )

A. 1/15B. 4/15C. 7/30D. 1/5

设二维随机变量(X,Y)的联合分布律为<img src="https://tihai-oss-cloud.itihey.com/img/5573b444637a2b48f11ffa2b50089512.jpg">,则P{X+Y=1}=( )

A. 5/20B. 1/5C. 1/10D. 3/20

已知二维离散型随机变量(X,Y)的分布律为<img src="https://tihai-oss-cloud.itihey.com/img/48b464d09a3e56453d2d93ef02603414.png">, 则P{X+Y≤3}=( )

A. 0.25B. 0.625C. 0.5D. 1

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