| 摘要 |
A processing unit comprising a plurality of tanks. Each tank is designed to contain a respective one of different processing solutions which are to be used at different stages of the process and having transport mechanisms by which material to be treated therein is introduced into the tank for processing and for transporting the material out of the tank to the next tank for treatment in each tank in turn. The transport mechanism by which material to be treated in one of the tanks is transported out of that one tank is at a higher level by which treated material is introduced into the next tank.
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