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  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  The Machines Used for Energy Generation
E   Seeking New Sources of Energy
F  The Use of Ultraviolet Radiation in Medicine
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答案B
解析
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