2. 外语
  3. A、save electricity by converting unused sunlight into power through the use of photocells B、waste less electricity by insulating

A、save electricity by converting unused sunlight into power through the use of photocells B、waste less electricity by insulating

admin2009-05-19  51
问题
选项 A、save electricity by converting unused sunlight into power through the use of photocells
B、waste less electricity by insulating and reducing resistance in the conduits of the power grid
C、increase electrical efficiency by requiring consumers to use appliances that rely on less electricity
D、create a more reliable power grid by supplying electricity from a wider range of power plants
E、reduce the electricity necessary to powering a city by encouraging denser population growth
答案B
解析
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