再结晶退火作为软化材料的手段,常用于() ["A.冷塑性变形后的零件","B.淬火件","C.铸件","D.锻压件"]
如何提高轻油收率?
基本偏差代号n和p的轴与基本偏差代号为H的孔可以构成() ["A.间隙配合","B.过渡配合","C.过盈配合","D.过渡配合或过盈配合"]
冷加工金属经再结晶退火后,下列错误的是() ["A.其晶粒形状会改变","B.其机械性能会发生改变","C.其晶格类型会发生改变","D.其晶粒大小会发生改变"]
关于钢的再结晶温度() ["A.低于A1","B.高于A1","C.低于A3","D.高于A3"]
蜡油集油箱溢流后如何处理?