2. 外语
  3. In the metals industry, hydrogen is used to prevent metals from tarnishing while undergoing______.

In the metals industry, hydrogen is used to prevent metals from tarnishing while undergoing______.

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问题 In the metals industry, hydrogen is used to prevent metals from tarnishing while undergoing______.
选项 A、treated by heat
B、heat treatments
C、by heat treatments
D、heat-treated
答案B
解析
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