【判断题】
铁的溶碳能力决定于晶格中原子间隙的形状和大小
A. 对
B. 错
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A
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球化珠光体硬度、强度较低、塑性较高,一般作为最终热处理组织
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熔化极氩弧焊比钨极氩弧焊的焊接生产率低
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熔化极氩弧焊采用纯氩保护焊不锈钢,可以获得较高质量的焊缝
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电渣焊渣池的温度比电弧要低得多,所以电渣焊的生产率没有电弧焊高
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奥氏体不锈钢具有很大的电阻,所以不锈钢焊条焊接是药皮容易发红
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焊缝不对称时,应该先焊焊缝少的一侧,以减少弯曲变形量
A. 对
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多层堆焊时,由于加热次数多,且加热面积大,致使焊件容易产生变形,甚至会产生裂纹
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劳动者通过诚实的劳动,___
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B. 仅仅是为了增进补会共同利益而劳动
C. 在改善自己生活的同时,也是为建设国家而劳动
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焊工应___,但他不属于焊工职业守则。
A. 重视安全生产
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在零件图中表示普通螺纹尺寸时,用字母___写在数字前面。
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低碳钢的室温组织为___加铁素体。
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高碳钢中,碳质量分数为___
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C. >0.70%
D. >0.60%
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在并联电路中的总电阻值小于各并联电阻值,并联电阻越多其总电阻越小,电路中的总电流___
A. 越大
B. 越小
C. 近似
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测量电流时只能使用电流表,用符号___表示。
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用交流电压表直接测量时,电压表应并联在被测电路上,扩大交流电压表量程应配用___。
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在可能导电的焊接场所工作时,所用焊工防护手套应经耐电压___试验,合格后方能使用。
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焊接前,焊工应对所使用的角向磨光机进行安全检查,但___不必检查。
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下列选项中,___不是焊条药皮的组成物。
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钨极的一端常涂有颜色,以便识别,钍钨极为___色。
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【单选题】
___是一种自动埋弧焊常用的引弧方法。
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手工钨极氩弧焊设备中没有___
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【单选题】
21.氩弧焊机供气系统没有___
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The following except are guaranteed in the Bill of Rights.
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The U. S. lies in North America, with Canada to the north, Mexico to the south, the Atlantic to its and the Pacific to its .
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is a representative of English Critical Realism at the turn of the 19th century.
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is viewed as Romantic poetry’s “Declaration of Independence.”
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Of the following, is NOT a common feature of all the British holidays.
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To be admitted to the Open University, one need .
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