2. 外语
  3. Heat is transferred from one substance to another by conduction, convection,______.

Heat is transferred from one substance to another by conduction, convection,______.

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问题 Heat is transferred from one substance to another by conduction, convection,______.
选项 A、and radiation
B、or by radiating
C、and it radiates
D、also of radiation
答案A
解析 And radiation completes the list of three parallel nouns: conduction, convection, and radiation.
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