【单选题】
焊缝中，与氢无关的缺陷是___。
A. 气孔
B. 白点
C. 冷裂纹
D. 时效硬化
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答案
D
解析
暂无解析
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( ) 26. Where does the writer of "The little Prince" come from?
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( ) 37.The greatest river for navigation is ___________.
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