现有技术中的阀门不能根据液体的密度变化控制阀的开启状况，从而保持液体的密度不变。
In available technology, there is no valve with controlled opening based on the density of liquid to maintain unchanged liquid density.
现有技术中的阀门不能根据液体的密度变化控制阀的开启状况，从而保持液体的密度不变。
In available technology, there is no valve with controlled opening based on the density of liquid to maintain unchanged liquid density.
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