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【单选题】
气焊熔剂的作用有：（）、减少有害气体的浸入、去除熔池中形成的氧化物杂质及增加熔池金属的流动性。A.
改善焊接接头的化学成分
B.
提高焊接接头的力学性能
C.
保护熔池
D.
起填充金属作用
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