Currently, the most successful method of harnessing and using solar energy to produce electricity is the photovoltaic devices.
Answer the following statement true (T) or false (F)
True
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Compared with the resultant of a pair of equal-length vectors at right angles to each other, the resultant when the angle is less than 90° is
A. less. B. greater. C. the same. D. need more information
The European Commission's "20/20/20 by 2020" plan refers an overall European attempt to:
A. become more environmental. B. reform the education systems. C. improve healthcare, especially the vision of children. D. stimulate the economy.
You have a land use map that shows land use classes of urban, agricultural, commercial, and so on. Which operation will you use to get a new map that only shows agricultural land use?
A. Eliminate B. Clip C. Erase D. Select
Organisms commonly develop new traits because they desire them.
Answer the following statement true (T) or false (F)