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珠光体钢和奥氏体不锈钢焊条电弧焊时,生产中广泛采用E310—16和E310—15焊条,得到抗裂性能好体焊缝组织。()

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焊机的安装、修理和检查应由焊工进行。()

Recently, there is a common phenomenon in the tier-one cities that a great number of white-collar workers choose to flock home or to tier-two cities. As a result, there have been many arguments for or against the homecoming tide. What is your opinion？ Write an essay of about 400 words to state your view. In the first part of your essay you should state clearly your main argument, and in the second part you should support your argument with appropriate details. In the last part you should bring what you have written to a natural conclusion or make a summary. Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the above instructions may result in a loss of marks.

焊接电源绝缘的可靠性、接线的正确性、电源的动特性、接地的可靠性、电源的外特性等,在焊条电弧行检查。()

骑座式管板仰焊位盖面焊采用多道焊时可有效防止产生咬边缺陷,外观平整、成形好。()