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【多选题】
影响土壤有机质转化的因素有( )。A.
有机残体的C/N比。
B.
土壤水分及通气
C.
土壤温度
D.
土壤生物生产力
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举一反三
【单选题】There are two countries on a peninsula. The first has a per capita annual growth rate of 2%, and its neighbor to the south has an annual growth rate of 5%. How much sooner will the country in the sout...
A.
5 years
B.
10 years
C.
15 years
D.
21 years
【单选题】Over the last half-century, which of the following countries has had the highest growth rate of output per capita?
A.
Japan
B.
France
C.
United Kingdom
D.
United States
【简答题】Economic growth, that is the growth of GDP per capita, can be achieved by means of:A. technological change. B. factor accumulation. C. both A and B. D. None of the above.
【单选题】Suppose a panel of economists predicts that a nation's real GDP per capita will double in approximately 20 years. According to the rule of 70, what must be the predicted annual growth rate of real GDP...
A.
140%
B.
3.5%
C.
2.85%
D.
14%
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