滤料介质包括：石英砂、无烟煤、磁铁矿、锰砂、硅藻土、等。

The filler material media includes:quartz sand, anthracite, magnetite, manganese sand, diatomite, etc.

youdao

滤料介质包括：石英砂、无烟煤、磁铁矿、锰砂、硅藻土、等。

The filler material media includes:quartz sand, anthracite, magnetite, manganese sand, diatomite, etc.

youdao