国家职业资格考试高级焊工模拟试题2.docVIP

国家职业资格考试 高级焊工模拟题 一、单项选择（第1题～第80题选择一个正确的答案，将相应的字母填入题内的括号中每题1分，满分80分）压缩空气氧气氟利昂氨气应该夹渣((＞40 B. D/(((=40 C. D/((＜40 D. D/((＜30 74．对于低碳钢板热弯曲时，其加热温度为（ ）。 A. 900～1100℃ B. 500～700℃ C. 300～500℃ D. 100～300℃ 75．布氏硬度试验时，其压痕中心与试样边缘的距离应不小于压痕直径的（ ）。 A. 2倍 B. 2.5倍 C. 1倍 D. 3倍 76．冲击试验时，试验机将具有一定重力G的摆锤举至一定高度H，使其获得一定的（ ）（GH），然后使摆锤自由落下，将试样冲断。 A. 势能 B. 动能 C. 机械能 D. 冲击能 77．绝大部分触电死亡事故是由于（ ）造成的。 A. 电击 B. 电伤 C. 电磁场生理伤害 D. 电弧 78．X法评定，每周期沸腾试验是（ ）。 A. 6h B. 12h C. 24h D. 48h 79．一般常用的显现粉是（ ）。 A. 氧化铝 B. 氧化镁 C. 氧化锌 D. 二氧化钛 80．在焊条电弧焊焊接电流为60～160A时推荐使用（ ）号遮光片。 A. 5 B. 7 C. 10 D. 14 二、判断题（第81题～第100题将判断结果填入括号中正确的填“”，错误的填“”。每题1分，满分20分） of vision. 3, build, fitting in with the urban master plan in Yibin city rapid rail transit long term network, as well as the vision of Yibin city, and future development of rail transit network. 4, Yibin city, preliminary rail traffic levels service levels, system model, and technical standards. 5, to ensure that network can be implemented. 6, stable conditions for planning and supporting of Yibin city track traffic construction and formation of rail transit industry, provide conditions for the start-up and development of rail transit in Yibin city. 1.7 technical course technology is the projects research program and research ideas. Technology reflects the various stages in the process, logical relations between various levels, research, techniques and phases. Network planning process the whole process can be divided into four parts, namely, background research, network architecture research, planning and implementation of research and programming interfaces. Figure 1.7-1 Yibin city rail transit network planning technology roadmap planning interface is mainly responsible for network planning interface with follow-up planning tasks. Network planning Urban planning system in a transitional position, online netwo