题目内容

Ricardo's land rent theory mainly studies differential land rent, which is based on the labor theory of value.

A. 对
B. 错

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The Labor theory of value is the basis of Ricardian economics, and income distribution theory is the core of it.

A. 对
B. 错

David Ricardo was a positive supporter of free trade, but he did not object to the state's intervention in foreign trade.

A. 对
B. 错

当Al2(SO4)3与Na2CO3两种溶液混合时,有何现象( )。

A. 无明显现象
B. 有白色沉淀生成
C. 有白色沉淀生成,同时有气体产生

当溶液中同时存在氯离子和铬酸根离子时,先沉淀的是

A. 白色的AgCl
B. 砖红色的铬酸银沉淀

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