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【单选题】
Suppose that when the price of beer is $2 per bottle, firms can sell 4 million bottles. When the price of beer is $3 per bottle, firms can sell 2 million bottles. Which of the following statements is true?_________.A.
The demand for beer is price elastic, and so an increase in the price of beer will decrease the total revenue of beer producers
B.
The demand for beer is price inelastic, and so an increase in the price of beer will increase the total revenue of beer producers
C.
The demand for beer is income inelastic, and so an increase in the price of beer will increase the total revenue of beer producers
D.
The demand for beer is income elastic, and so an increase in the price of beer will increase the total revenue of beer producers
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【简答题】International Liquidity
【单选题】采用紫外-可见分光光度法测定蔬菜中NO2-含量,样品的提取液为黄绿色,显色后生成红色产物(显色剂无色),于540nm处测定吸光度。测定样品时应选择的参比溶液是
A.
溶剂空白
B.
试剂空白
C.
蒸馏水
D.
平行操作空白
【简答题】international finance
【简答题】International Reserves
【简答题】international trade
【简答题】International Factoring
【单选题】分光光度法测量条件的选择:采用紫外 - 可见分光光度法测定蔬菜中 NO2- 的含量,试液提取液为黄色, NO2- 与无色的显色剂显色后生成红色产物,与 540nm 处测定其吸光度。应选取的参比溶液是
A.
溶剂空白
B.
试剂空白
C.
试样空白
D.
平行操作空白
【单选题】采用紫外 - 可见分光光度法测定蔬菜中 NO 2 - 含量,样品的提取液为黄绿色,显色后生成红色产物 ( 显色剂无色 ) ,于 540 nm 处测定吸光度。测定样品时应选择的参比溶液是( )
A.
溶剂空白
B.
试剂空白
C.
试样空白
D.
蒸馏水
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