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【简答题】
20克硝酸钾溶解在100g水中,全部溶解后,所得硝酸钾溶液中溶质质量分数为( ) (结果保留一位小数)
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【单选题】Because agriculture is so important to a nation's well-being, governments have always been concerned with it. For example, the United States and Canada have long produced surpluses that complicate the...
A.
they throw the country into great disorder
B.
they entail more expenditure on the part of the government
C.
they usually involve direct governmental support price
D.
the government has to set up special pricing systems
【单选题】Farmers have always had a particular interest in the weather, because it ( ) their work.
A.
accelerates
B.
effects
C.
affects
D.
exerts
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