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【简答题】
假设某产品的边际收入函数为 (万元/), 边际成本函数为 (万元/), 其中产量 以为单位,则(1)当产量由4增加到5时利润的变化量 万元 ;(2)利润最大时的产量为 ;(3)已知固定成本为1万元,产量为4时总成本为 万元 ;总利润为 万元 ;
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【单选题】Private cars are becoming very popular though most of them still ______too much
A.
pay
B.
cost
C.
sell
D.
spend
【简答题】求比值． 13 24 ： 九2 9 &u1sp;&u1sp;&u1sp;&u1sp;&u1sp; 0.8：0.24&u1sp;&u1sp;&u1sp;&u1sp;&u1sp;&u1sp;&u1sp; 39：11.7．
【单选题】Soccer, the most popular ________ever created by man,attracts countless fans worldwide
A.
sport
B.
event
C.
match
D.
court
【简答题】按财产清查的范围划分，财产清查可以分为内部清查和外部清查。 （ ）
【多选题】Which statements of sub-health are true? ( )
A.
Sub-healthy people are not suffering from organic or functional diseases and disability.
B.
Over 70 ％ of the sub-healthy people are from major cities.
C.
Sub-health is a state featuring physiological function deterioration between health and illness.
D.
Sub-health is also known as the third state or the “ gray state ” .
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