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【单选题】
金属材料的工艺性能是指___
A. 冷加工性
B. 热加工性
C. 冷热可加工性
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答案
C
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蒸汽锅炉爆炸破坏程度取决于___
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堆焊圆形工件,当焊丝直径为1.6mm时,堆焊螺距为___
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等离子弧焊的电弧热量可以熔透的工件深度和切割速度___
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利用局部加热方法将联接处的金属加热至熔化状态而完成的焊接方法,称为___。
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等离子弧焊接和切割采用的引弧方式是___
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关于各种气体以下说法错误的是___
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等离子弧切割时的切割电压超过电源空载电压___时容易熄弧。
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为确保操作者的人身安全,避免和减少相关事故的发生,在易燃易爆场所焊接,焊接前必须___
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原子氢焊选用的安全电压值不超过___V
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氧-乙炔焰堆焊时,主要危险是___
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下列选项中属于防灼伤措施的是___
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压焊工作中容易发生的事故不包括___
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