题目内容

助焊剂的作用是：除去焊接金属表面的氧化膜,在焊接物表面形成液态的保护模,并顺利完成焊接

A. 对
B. 错

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公鸡的结果是什么？

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建筑石膏是【】型的【】石膏,硬化后的石膏的化学成分是【】。