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【多选题】
What are the reasons that could account for the poor quality of netwriting?A.
You need to think of netwriting as "written speech".
B.
Written on the Internet have little literary value, so they're not meant to be permanent. They just come and go and no one will ever remember them once they are read.
C.
Many online postings are produced under great time pressure.
D.
There is actually no threshold on the Internet, so that anyone can log on and send out what they have written.
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举一反三
【简答题】设 是相互独立的随机变量, , , , , 问 是否服从切比雪夫大数定律?
【单选题】肉眼观察肉芽组织呈颗粒状是由于
A.
新生的毛细血管呈团块状
B.
新生的毛细血管呈袢状弯曲状
C.
炎症细胞灶性集聚
D.
巨噬细胞的灶性集聚
E.
成纤维细胞形成过多
【简答题】反手攻球技术的动作要领?( 50 分)
【单选题】设 是相互独立的随机变量,且都服从标准正态分布,
A.
img src="http://p.ananas.chaoxing.com/star3/origin/eb0a0b09d96f8be913ebec6bec107f0e.png"> ( )
B.
mg src="http://p.ananas.chaoxing.com/star3/origin/d1fd2d0e9d4e1c8841a4806830c27b14.png">
C.
mg src="http://p.ananas.chaoxing.com/star3/origin/9faa02b7ccc859922b6db65466ec3cf7.png">
D.
mg src="http://p.ananas.chaoxing.com/star3/origin/db174c140bd266a9d65d570fda0dd65a.png">
E.
mg src="http://p.ananas.chaoxing.com/star3/origin/ec9e389ac1ae0c3310fe102680918a44.png">
【简答题】设 是相互独立的随机变量 , , , 令随机变 量;则Z的分布 为 , 熵 。
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