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【单选题】
设X1，X2是任意两个相互独立的连续型随机变量，他们的密度函数分别为f1(x)和f2(x),分布函数分别是F1(x)和F2(x),则()A.
f1(x)+f2(x)必为密度函数
B.
F1(x)×F2(x)必为分布函数
C.
F1(x)+F2(x)必为分布函数
D.
f1(x)×f2(x)必为密度函数
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反馈参考答案：
举一反三
【单选题】After a whole day’s hard work, they went back home, ____________.
A.
hungry and tiredly
B.
hungry and tired
C.
hungrily and tiredly
D.
hungrily and tired
【简答题】身体条件与技术指导的差异性
【单选题】___________I have enough energy left after a day’s hard work, I will go dancing in one of the clubs.
A.
Shall
B.
Can
C.
Would
D.
Should
【单选题】Which of the following was NOTa denomination of Protestantis m?
A.
Catholics
B.
Puritans
C.
Quakers
D.
Church of England
【简答题】请将下面四句话中用拼音“de”标注的部分换成相应的结构助词。 a.彻底de( )解决问题是不容易的。 b.问题彻底de( )解决了。 c.问题解决de( )不彻底。 d.问题得到了彻底de( )解决。
【简答题】阅读理解 An old man was going home late one night with his horse and cart after a day's hard work. When he was not far from his house, the light on the cart went out. He tried but could not mend (修理) it. ...
【单选题】According to Anderson's view of colonial history, which of the following was true of the Mughal Empire's collapse mentioned in lines 22-23? Ⅰ. It paralleled and foreshadowed the subsequent collapse of...
A.
Ⅰ only
B.
Ⅱ only
C.
Ⅰ and Ⅱ only
D.
Ⅱ and Ⅲ only
E.
Ⅰ, Ⅱ, and Ⅲ
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