The purification layer is an active carbon powder layer or a mixed layer of active carbon powder and active floridin powder.
净化层为活性炭粉层或者为活性炭粉和活性白土粉混合层。
The purification layer is an active carbon powder layer or a mixed layer of active carbon powder and active floridin powder.
净化层为活性炭粉层或者为活性炭粉和活性白土粉混合层。
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