mass mean diameter 质量平均径 ; 质量平均粒径
The results showed that mass mean diameter (MMD), and drop size distribution parameter N changed with pressure drop, air velocity, and fuel viscosity.
结果表明，液雾的质量中间直径（MMD）和尺寸分布参数N将随着喷嘴压力降、空气流速、燃油性质而变化；
Carrot root mass and diameter were superior to mean traits of parents in heredity.
根重、根粗性状在遗传中表现出较高的超中亲现象。
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