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
surface active substance
surface active substances
surface active material
surface reactive materials
Surfactance
surfactant matter
Surfactant alveolar
Surfactant
surface-active substances
Surface-active substance