The vacuum system of the wet end of a papermachine could be a centralized system or some individual systems for the vacuum points.
造纸机湿段真
可以是:总的真或各真点独立的真。
The vacuum system of the wet end of a papermachine could be a centralized system or some individual systems for the vacuum points.
造纸机湿段真可以是:总的真或各真点独立的真。
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