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【简答题】
设两个随机变量X，Y相互独立，且都服从均值为0、方差为1/2的正态分布，求随机变量|X-Y|的方差．
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反馈参考答案：
举一反三
【单选题】听力原文：W: I can't believe I have almost spent all $ 4,000 of my student loan. That money was supposed to last me all year. M: Maybe you should start living within your means, like you've been told time ...
A.
She Should find a job.
B.
She should just stop worrying.
C.
She should be more realistic with her money.
D.
She should ask for more money from the loan office.
【单选题】听力原文：M: I can't believe I have almost spent all $9,000 of my student loan．That money was supposed to last me all year． W: Maybe you should start thinking twice before you spend money, like you've been...
A.
Spend money more reasonably.
B.
Find a job to support his family.
C.
Apply for student loans again.
D.
Stop worrying about money.
【简答题】I spent almost all my spare time surfing the Internet. I'm absolutely a ( ) 网虫.A. mouse potato
【简答题】电路如图所示 R 1 = R 3 =R 4 =R f =5k Ω , u 1 =10V , u 2 =5V ,求输出电压 u 0 。
【单选题】I spent almost all my spare time _______ the Internet .
A.
surf
B.
surfing
C.
surfed
D.
surfs
【简答题】已知二端口电路如图所示，R 1 =R 2 =R 4 =R 5 =900Ω，R 3 =450Ω，试求其T形等效网络。
【简答题】I spent almost all my spare time surfing the Internet so I'm absolutely a mouse potato.
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