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______.

admin2013-04-25  49
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
转载请注明原文地址:https://www.kaotiyun.com/show/AayO777K
0

托福（TOEFL）

相关试题推荐
随机试题
最新回复(0)