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【判断题】
泌尿系统由肾、输尿管、膀胱和尿道四部分组成A.
正确
B.
错误
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举一反三
【简答题】电液动换向阀是由( )和液动换向阀组成的复合阀。
【单选题】Economists normally assume that the goal of a firm is to:
A.
sell as many units of output as possible.
B.
maximize profits.
C.
sell products at the highest prices possible.
D.
maximize sales revenue.
【单选题】Economists normally
A.
do not try to explain people's tastes, but they do try to explain what happens when tastes change.
B.
believe that they must be able to explain people's tastes in order to explain what happens when tastes change.
C.
do not believe that people's tastes determine demand, so they ignore the subject of tastes.
D.
incorporate tastes into economic models only to the extent that tastes determine whether pairs of goods are substitutes or complements.
【单选题】Economists normally assume that the goal of a firm is to
A.
maximize its total revenue.
B.
maximize its profit.
C.
minimize its explicit costs.
D.
minimize its total cost.
【简答题】电液换向阀是由()和()组成的复合阀
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