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【单选题】
A construction company has built 25 houses so far this year at a total cost to the company of $7.2 million. If the company builds a 26 th house, its total cost will increase to $7.5 million. Which of the following statements is correct?A.
For the first 25 houses, the average cost per house was $288,000.
B.
The marginal cost of the 26 th house, if it is built, will be equal to the average cost per house.
C.
If the company can experience a marginal benefit of $288,000 by building the 26 th house, then the company should build it.
D.
All of the above are correct.
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【简答题】计算机网络采用层次结构，各层之间互相【 】。
【多选题】下列属于常用的定期租船合同格式的是:
A.
《金康合同》（ GENCON ）
B.
《波尔的姆》（ BALTIME ）
C.
《纽约土产合同》（ NYPE ）
D.
《贝尔康格式光租合同》（ BARECON ）
【简答题】计算机网络采用层次结构,各层之间相互 ( ) 。