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【单选题】
产生焊缝尺寸不符合要求的主要原因是（）或装配间隙不均匀焊接工艺参数选择不当。A.
焊件钝边开得不当
B.
焊件坡口开得不当
C.
焊件太厚
D.
焊件温度过高
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【判断题】Nowadays, more young people tend to enjoy American public holidays and festivals. As for Ms. Chen, she can understand this new trend since young Chinese are willing to accept new things, like Christm...
A.
正确
B.
错误
【简答题】Scientists have reached the conclusion _____ the temperature on the earth is getting higher and higher . A.what B. that C.it D. because 2. I’m not _____ to think I can succeed without efforts . A.n...
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