In batch distillation, the composition of the source material, the vapors of the distilling compounds and the distillate change during the distillation.
间歇式蒸馏时，原料的成分、所蒸馏的化合物的蒸汽及蒸馏物在蒸馏过程中是变化的。
Physical properties involve no change in the composition of the material.
有形资产不介入在材料的构成的上变化。
Revealed material size-composition influence law to briquetting quality by study of granularity change of material briquetting and briquetting experiment of different size-composition of material.
通过对粉煤成型前后粒度的变化研究和不同粒度组成原料的成型实验，揭示了原料粒度组成对型煤质量的影响规律。
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