物质和精神属性
Material and Spiritual Characters
主要金属元素之物理性质
Physical properties of major Metal Elements
磁性物质质量分数
mass fraction of magnetic substances
半挥发性物质
semivolatile organic compounds
表面活性物质
Surfactance
surfactant matter
Surfactant alveolar
Surfactant
surface-active substances
surface active substance
surface active substances
Surface-active substance
surface active material
surface reactive materials