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【单选题】
设随机变量 和 的方差都存在且不等于 0 ,则 是 和A.
独立的充分必要条件
B.
独立的充分但非必要条件
C.
不相关的充分但非必要条件
D.
不相关的充分必要条件
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反馈参考答案：
举一反三
【单选题】关于主动脉瓣第二听诊区呈递减型叹气样舒张期杂音,错误的是
A.
可见于风湿性心瓣膜病的主动脉瓣关闭不全
B.
可见于先天性心脏病的主动脉瓣关闭不全
C.
可见于扩张型心肌病
D.
可见于特发性主动脉瓣脱垂
E.
可见于马方综合征
【简答题】两道问答题二选一作答即可。
【简答题】表单对象属性过滤选择器 2.表单对象选择器
【多选题】How to Break the Habit of Watching Too Much TV
A.
Add one more activity into your schedule every week.
B.
Write a list of other activities you like to do.
C.
Choose one or two hours when you usually watch TV. Write down a different activity.
D.
Set a goal to watch less TV.
E.
Celebrate when you achieve your goal.
F.
Make a TV schedule.
【简答题】Jessie felt her life so boring one summer day. She was so tired of watching TV, she read all her books, and her friends were on vacation. She wanted something different to do. Suddenly, she saw the la...
【判断题】One of watching too much TV's effects is shortening people's attention span.
A.
正确
B.
错误
【简答题】Jessie felt her life so boring one summer day. She was tired of watching TV, she read all her books, and her friends were on vacation. She wanted something different to do. Suddenly, she saw the lawn ...
【简答题】计算下面两道题，说说你计算的想法． 506×45= 780×34=
【单选题】在一台WWW服务器上将端口号设定为8000,默认的网页文件index.html。在本机访问服务器时,不正确的用法是( )
A.
浏览器访问该服务器的URL地址http://localhost/
B.
浏览器访问该服务器的URL地址http://localhost:8000/
C.
浏览器访问该服务器的用户li网页URL地址http://localhost:8000/~li
D.
浏览器访问该服务器的URL地址http://localhost:8000/index.html
【简答题】以下有两道题，请你选择一道题作答。 （1）已知 ，试确定|a|﹣|b|+|a+b|+|ab|的值； （2）如果a，b，c，d为互不相等的有理数，且|a﹣c|=|b﹣c|=|d﹣b|=1，试确定|a﹣d|的值。
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