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【单选题】
钨极氩弧焊水平固定管焊接时,接头处的焊缝应相互重叠( )。A.
10〜15 mm
B.
15〜20 mm
C.
2〜5 mm
D.
8〜10 mm
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【简答题】请根据材料内容，完成各题。 We always seem to want those things we don't have. Moreover, we are often convinced（使相信） that if we had those things we want so badly, we would finally be happy. The truth is that happin...
【单选题】听力原文：W: Steve has taken two part-time jobs but he's decided to drop one of them at the end of this month. M: That may be for the best. What does the man mean?
A.
It would be best to drop both.
B.
Steve's part-time jobs are the best for him.
C.
Steve is really working too hard.
D.
Steve's decision may be a good one.
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