working reference substance工作对照品
working standard substance工作标准物质
phase change working-substance material相变工质材料
organic working substance有机工质
working substance for replacement替代工质
natural working substance天然工质
alternative working substance替代工质
mixture working substance混合工质
ideal working substance理想工质
N（名词） the fluid, esp water, steam, or compressed air, that operates an engine, refrigerator, etc 工作物质