题目内容

Hydroelectric dams on a river typically results in I. displaced native speciesII. reduced agricultural landIII.improvement in downstream ecosystemsIV. reduction of recreational areas for people

A. I, II
B. III, IV
C. I, II, III
D. I, II, III, IV
E. I, IV

查看答案
更多问题

Which of the following renewable energy sources generates the most emissions?

A. solar photovoltaic cells
B. hydrogen fuel cells
C. wind energy
D. tital energy
E. solid biomass

Which of the following best described the amount of electricity used in the United States is harnessed from wind?

A. less than 10%
B. between 10% and 15%
C. between 15% and 20%
D. between 20% and 25%
E. more than 25%

Which source of energy is not ultimately solar based?

A. biomass
B. tides
C. wind
D. coal
E. hydroelectricity

It currently takes about 3 units of coal to produce 1 unit of power. What will improve if the ratio becomes 1:1?

A. energy convervation
B. energy cogeneration
C. energy production
D. potential energy
E. energy efficiency

答案查题题库