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。
Cost down: Development cost-down affairs, such as open second source suppliers, change parts material, optimize parts' structure.
降低成本：开发第二供应商，替换材料，结构优化等；
Cost down: Development cost-down affairs, such as open second source suppliers, change parts material, optimize parts' structure.
降低成本：开发第二供应商，替换材料，结构优化等；
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