2. 外语
  3. A Nuclear Reactions as the Lasting Source of the Sun’s Energy B The Most Important Source of Energy C Types of Electromagneti

A Nuclear Reactions as the Lasting Source of the Sun’s Energy B The Most Important Source of Energy C Types of Electromagneti

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问题 A  Nuclear Reactions as the Lasting Source of the Sun’s Energy
B  The Most Important Source of Energy
C  Types of Electromagnetic Energy
D  he Machines Used for Energy Generation
E  Seeking New Sources of Energy
F  The Use of Ultraviolet Radiation in Medicine
A  when it is absorbed by matter
B  when it is cloudy
C  because they can pass through solid objects
D  when the sunrays are fierce
E  when a change in the nucleus of an atom takes place
F  when electron rearrangement takes place
选项
答案B
解析
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