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【单选题】
若随机变量 与 相互独立,且方差 ,则A.
9
B.
24
C.
25
D.
2
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反馈参考答案：
举一反三
【单选题】在数控车床上手动输入完程序后，将光标至于程序开头，正确的做法是（）
A.
编辑方式-点击复位功能键
B.
手动方式-点击复位功能键
C.
录入方式-点击复位功能键
D.
自动方式-点击复位功能键
【简答题】阅读下面的短文，判断文后的句子是否与短文内容相符，复符合的选T， 不符合的选F。 Life in 2050 What will life be like in the year 2050? No one knows, but of course it will be very different from it today Here are some predictions: Firstly, p...
【单选题】What does the professor imply when he say this?
A.
Anthropologists record the way of life of some inconsequential tribes.
B.
Anthropologists prevent the extinction of some aboriginal cultures.
C.
Anthropologists track down the stories with primitive background.
D.
Anthropologists do research on different aspects of human lif
【简答题】Tony Wheeler was born to travel. His father worked for an airline. For the first 16 years of his life，Wheeler and his family lived in many different countries. In the early 1970s，Wheeler met a young w...
【简答题】Tony Wheeler was born to travel. His father worked for an airline. For the first 16 years of his life. Wheeler and hisfamily lived in many different countries. In the early 1970s, Tony met a young wom...
【单选题】He is _______fat because he eats _________junk food.
A.
much too;too much
B.
too much;much too
C.
too much;too much
D.
much too;much too
【简答题】请你阅读短文,并选择适当的单词填空. vegetables because going difficult longer It's the year 2050 now. Life is very different from life in 2011. There are more people and cars in the world．It's more 1. ____...
【单选题】I have _______homework to do at school, and I have ______rules at home.
A.
too much; too many
B.
too much; too much
C.
too many; too much
D.
too many; too many
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