闪光对焊的特点是()A、焊接前先将被焊件接触B、焊接前把被焊件安装好并保持一定距离C、闪光对焊焊缝处很光滑D、只能焊接相同的材料...
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共析钢在奥氏体的连续冷却转变产物中,不可能出现的组织是()。A、珠光体B、索氏体C、贝氏体D、马氏体...
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型砂中水分过多,会造成铸件产生()。A、气孔B、缩孔C、砂眼D、热裂...
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铸件各部分的壁厚差异过大时,在厚壁处易产生()缺陷,铸件结构不合理,砂型和型芯退让性差易产生()缺陷。...
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液态金属充满铸型型腔获得形状完整、轮廓清晰铸件的能力称为合金的流动性。...
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蠕墨铸铁的()明显低于球墨铸铁。A、铸造性能B、导热性C、强度D、焊接性能...
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