不是发现过银和铅的混生矿吗？
研究了我国烟叶主产区2004年生产的497份烤烟样品和17份白肋烟样品中铅、镉、砷的含量及分布特征。
The contents and distribution of Pb, Cd and As in 497 flue-cured and 17 burley tobacco leaf samples collected from major tobacco production regions of China in 2004 were studied.
云南相同主产地的生茶和熟茶中铅含量没有显著性差异。
The lead content was no significant difference between raw tea and ripened tea from the same sources.
应用推荐