金刚石属于()晶系。 ["立方","六方","四方","斜方"]
简述刃型设计的一般原则。
197726型轴承压装到车轴上前()。 ["必须逐个选配","应按批进行选配","应对轴颈、防尘板座及轴承内圈直径进行尺寸公差测量","应清洗轴承各部和轴颈配合表面"]
197726型轴承压装到RD2车轴轴颈的终止贴合力应()。 ["≥88.2~247kN","≥157~226kN","≥284.2~446kN","≥58.8~127.4Kn"]
当配位多面体为八面体时,正负离子半径比为()。 ["0.732-1","0.414-0.732","0.225-0.414","0.155-0.225"]
简述钢种、矫直温度、矫直速度对矫直力的影响。