钢轨打磨时,其他人员应远离打磨()。A、左侧B、前方C、两侧和前方D、左侧和前方...
Saturday, March 18, 2023
Tuesday, September 13, 2022
Thursday, September 15, 2022
GAAs80/580闪光焊机在预热过程中测量变形量,如果新测量的...
Tuesday, September 13, 2022
铝热焊接结束后,作业人员不需对作业场所和料具清理直接撤离现场。...
Tuesday, September 13, 2022
铁道部规定:轨底角允许有少量光斑,单个光斑面积允许8mm<sup...
Thursday, September 15, 2022
德铝焊中,对封箱砂进行落砂试验的目的是检测封箱砂搅拌适度。...
Saturday, October 8, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
闪光焊防止产生疏松缺陷的措施其中有()。A、增大半熔化区的宽度B、增加顶锻压力C、延长有电流顶锻时间D、减短无电流顶锻时间...
Sunday, January 21, 2024
Saturday, March 4, 2023
起道机应放在距铝热焊缝()以外,避免用起道机直接顶起铝热焊接头,并避免做一些冷弯直轨工作。A、0.5MB、1.5MC、1MD、2M...
Tuesday, July 11, 2023
Wednesday, March 20, 2024
浇铸完成后进行热打磨,热打磨后钢轨顶面及作用边矢度必须控制在0~...
Tuesday, September 13, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
“晶粒度”是指晶粒大小的量度,它是通过金相显微镜进行观察的。...
Tuesday, September 13, 2022
铝热焊的主要反应是熔渣,其重要成分为AL<sub>2</sub>...
Tuesday, September 13, 2022
把固定直流电压变为固定的或可调的交流电压的是()。A、载波器B、逆变器C、整流器D、周波变换器...
Wednesday, June 21, 2023