常用物质组分
material composition in common use
腐殖物质组分
component of humic substances
物质组分特征
Characteristics of Components
组分物质平衡
compositional material balance
磁性物质质量分数
mass fraction of magnetic substances
地球原始物质组成
Original Earth composition
发芽抑制物质
Germination inhibitors
germination inhibitory substance
germination inhibitor