Tuesday, November 21, 2023
Thursday, November 24, 2022
Sunday, March 24, 2024
锻件在加热过程中,若出现了()缺陷,则只能报废。A、氧化B、脱碳C、过热D、过烧...
Thursday, February 1, 2024
Sunday, March 24, 2024
闪光对焊的特点是()A、焊接前先将被焊件接触B、焊接前把被焊件安装好并保持一定距离C、闪光对焊焊缝处很光滑D、只能焊接相同的材料...
Sunday, June 11, 2023
Thursday, January 11, 2024
Tuesday, November 21, 2023
Friday, November 24, 2023
容易获得良好焊缝成形的焊接位置是()。A、平焊B、立焊C、横焊D、仰焊...
Sunday, February 11, 2024
Sunday, March 24, 2024
型砂中水分过多,会造成铸件产生()。A、气孔B、缩孔C、砂眼D、热裂...
Sunday, October 8, 2023
可锻铸铁是由一定成分的白口铸铁经长时间高温石墨化退火得到。...
Monday, November 14, 2022
正火是将钢加热到一定温度,保温一定时间,然后()。A、随炉冷却B、在空气中冷却C、在油中冷却D、在水中冷却...
Sunday, March 24, 2024
Sunday, March 17, 2024
各种热处理工艺过程都是由()、()、()三个阶段组成。...
Thursday, February 1, 2024
磨削加工中,砂轮粒号过大,砂轮易(),磨削性能(),同时还会引起()。...
Friday, February 2, 2024
蠕墨铸铁的()明显低于球墨铸铁。A、铸造性能B、导热性C、强度D、焊接性能...
Sunday, March 24, 2024
共析钢在奥氏体的连续冷却转变产物中,不可能出现的组织是()。A、珠光体B、索氏体C、贝氏体D、马氏体...
Thursday, February 1, 2024
铸件的壁或肋的连接应采用()A、锐角连接B、直角连接C、圆角连接D、交叉连接...
Sunday, March 17, 2024