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问题 单项选择题

下列选项中，属于期间费用的是（）。

A.制造费用

B.生产成本

C.预提费用

D.财务费用

答案

参考答案：D

解析：期间费用包括管理费用、销售费用和财务费用。

改错题
短文改错。
     此题要求改正所给短文中的错误。对标有题号的每一行作出判断：
     如有错误(每行只有一个错误)，则按下列情况改正：
     此行多一个词：把多余的词用斜线(＼)划掉，在该行右边横线上写出该词，并也用斜线划掉。
     此行缺一个词：在缺词处加一个漏字符号(∧)，在该行右边横线上写出该加的词。
     此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。
     注意：原行没有错的不要改。
I've really got to do something to lose weight because
I'm getting much too fat. I wash 't worried about it until I go
to see the doctor. He told me that I'd probably had a heart
attack while I started eating less. When you're on a diet you
have to stop eat too much even though you are always hungry.
They may be very hard to do and you certainly need a lot
of will-power to succeed. So I will stay on the health farm for a 
month I won't be able to eat much and so!'11 have to stick 
to my diet. I'll also do plenty of exercise, which won't give
me any harm too. Both the diet and the exercise will
help me to lose weight and feel more better.
1. _____
2. _____
3. _____
4. _____
5. _____
6. _____
7. _____                                     
8. _____
9. _____
10. _____
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解答题

某商店储存的50个灯泡中,甲厂生产的灯泡占60%,乙厂生产的灯泡占40%,甲厂生产的灯泡的一等品率是90%,乙厂生产的灯泡的一等品率是80%.

(1)若从这50个灯泡中随机抽取出1个灯泡(每个灯泡被取出的机会均等),则它是甲厂生产的一等品的概率是多少?

(2)若从这50个灯泡中随机抽取出2个灯泡(每个灯泡被取出的机会均等),这2个灯泡中是甲厂生产的一等品的个数记为ξ,求E(ξ)的值.
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