问题:作布氏硬度试验时,当试验条件相同时,其压痕直径越小,材料的硬度越...
Sunday, September 11, 2022
问题:曲柄滑块机构和摆动导杆机构产生急回运动的条件是相同的。()...
Sunday, September 11, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:有甲、乙两个工件,甲工件硬度是230HBS,乙工件的硬度是HRC...
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:将煤气与空气的混合物加热到着火温度,无需点火即可燃烧。()...
Sunday, September 11, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:退化加热过程中炉台气氛实际温度较设定温度允许波动()℃...
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:不锈钢卷出退火炉后有用水冷却的,也有用风冷却的。...
Monday, September 12, 2022
问题:机器生产从原材料(半成品)到成品,主要经过毛坯的制造、零件的机械加工与热处理、产品的装配三大阶段。()...
Tuesday, October 11, 2022
问题:退火炉操作工点炉前,必须检查所有()、阀门是否严密可靠。...
Thursday, March 28, 2024
问题:在保护气氛中,O2、H2O、CO2均是氧化性气氛。()...
Monday, December 18, 2023
Sunday, September 11, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:在选用电热元件材料时,必须考虑炉子的形状和工作状态,以免造成烧坏...
Sunday, September 11, 2022
Sunday, September 11, 2022