2. 外语
  3. ______of deuterium and tritium are fused, they produce a nucleus containing two protons and three neutrons.

______of deuterium and tritium are fused, they produce a nucleus containing two protons and three neutrons.

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问题 ______of deuterium and tritium are fused, they produce a nucleus containing two protons and three neutrons.
选项 A、The nuclei
B、In the nuclei
C、When the nuclei
D、Which nuclei
答案C
解析
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