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
DRAPL产品钢卷的内经为()mm。A、610;B、620;C、762。...
Saturday, August 19, 2023
当物体的温度降到零度时,物体的辐射传热过程也就终止了。()...
Sunday, September 11, 2022
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
一般连续式热处理炉的炉子包括加热保温、过时效等炉段,但无冷却段。()...
Thursday, September 29, 2022
Sunday, September 11, 2022
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
渗氮件在渗氮前要求组织为(),表层不许有(),表面粗糙度不得低于(),工件的边角应()。...
Wednesday, May 15, 2024
Sunday, September 11, 2022
Sunday, September 11, 2022
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
计算题:已知W熔点3380℃,Fe熔点1538℃,Cu熔点1083℃,说明钨在1000℃、铁在800℃,铜在600℃时处于什么加工状态?...
Tuesday, April 9, 2024
Monday, September 12, 2022
Monday, September 12, 2022
Sunday, September 11, 2022
T36×12/2-3左--表示梯形螺纹,螺纹大径为36mm;导程...
Sunday, September 11, 2022
Sunday, September 11, 2022
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