表面热处理后钢中心的性质
core properties of case hardened steel
热中子非弹性散射截面
thermal inelastic scattering cross section
原油中天然表面活性剂
natural surfactant in crude oil
圆环面的中性圈
Middle circle of the toroid
中性轴的面二次矩
second moment of area about neutral axis
基性—中性次火山岩系
basic intermediate subvolcanic rock series