Answer: the first to assay the following fe content, if iron content high, can use magnetic pulley cast the tail.

答：先化验以下铁含量，如果铁含量高，可以采用磁滑轮抛尾。

youdao

Answer: the first to assay the following fe content, if iron content high, can use magnetic pulley cast the tail.

答：先化验以下铁含量，如果铁含量高，可以采用磁滑轮抛尾。

youdao