在软熔过程中,一部分锡与带钢起反应,形成金属间化合物FeSn,即锡铁 合金层。
正确
暂无解析
Theassociationis________toraisingfundstohelptheblind.
Tosucceedinascientificresearchproject________.
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heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
Ipreferthisdiagram________thatone.