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【单选题】
二氧化碳气体保护焊中，CO 2 气体对焊接的影响是（）。
A.
二氧化碳气体属于氧化性气体，高温下可以将金属元素氧化
B.
在电弧高温下，会分解成一氧化碳和原子态的氧，易使其它合金元素氧化、烧损，从而降低焊接接头的合金元素含量及力学性能
C.
焊接过程中生成的氧化锰、二氧化硅等浮渣，会产生大量的一氧化碳，形成许多气孔
D.
以上都对
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