问题:通常情况下,随着铸态管管径的增大,离心机正向限位()。A、增大B、不变C、减少D、无关系...
Wednesday, August 9, 2023
Monday, September 12, 2022
Friday, September 30, 2022
问题:球墨铸铁管的热处理一般分为()、保温、急冷、缓冷四个阶段。...
Saturday, January 27, 2024
Monday, September 12, 2022
问题:生产大规格球墨铸铁管管壁厚时可选择碳当量稍()点。A、低B、高C、相同D、不相同...
Saturday, January 27, 2024
Thursday, October 19, 2023
Monday, September 12, 2022
Sunday, March 24, 2024
问题:屈服强度用符号()表示。A、σbB、σ0.2C、σsD、σe...
Saturday, April 27, 2024
Thursday, October 19, 2023
Monday, September 12, 2022
问题:DN200球化管的出铁温度为()。A、1480~1500℃B、1490~1510℃C、1510~1530℃D、1530℃以上...
Sunday, August 13, 2023
问题:DN400的管子其热芯盒工作温度210—230℃,固化时间是()...
Monday, September 12, 2022
Wednesday, July 26, 2023
Monday, September 12, 2022
问题:球铁管承插口密封工作面不得有连续的()沟纹。A、轴向B、径向C、任意方向D、以上都对...
Wednesday, July 26, 2023
问题:浇注过程中铁水经扇形包、斜流槽、()流入管摸中。...
Monday, September 12, 2022
Monday, September 12, 2022
问题:工艺要求DN400管重控制在()误差范围之内。A、±1%B、±10%C、±5%D、±8%...
Wednesday, February 1, 2023