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【单选题】
下列项目中不属于生产费用的项目是A.
生产产品而消耗的材料
B.
生产工人的工资
C.
企业管理人员的工资
D.
车间管理人员的工资
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反馈参考答案：
举一反三
【简答题】设X的密度函数如下,则E(X)= ,Var(X)= . (方差用a/b的分数形式)
【单选题】听力原文：M: Did you like the film? W: Not particularly. I was rather disappointed. I'd expected it to be much more exciting. Q: What can we learn from this conversation? (16)
A.
On the whole, she liked the film.
B.
She didn't see the film.
C.
The film was very exciting.
D.
The film wasn't as good as she'd expected.
【单选题】听力原文： To get a driver's license, you must take a series of tests. The first test is the vision test. This test checks your eyes to see if you have to wear glasses when you drive. The second test is a ...
A.
Your eye sight.
B.
Your driving ability.
C.
The mechanical condition of your car.
D.
Your knowledge of traffic regulations.
【多选题】设二维随机变量 ( X , Y ) 的概率密度函数如下,则( ).
A.
k = 1/8
B.
P ( X < 1, Y < 3)=3/8
C.
P ( X < 1.5)=27/32
D.
P ( X + Y < 4)=2/3
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