【单选题】中药阿胶砷盐检查:取本品2g,加氢氧化钙1g,混合,加入少量水,搅匀,干燥后,先用小火烧灼使其炭化,再经500~600°C炽灼使完全灰化,放冷,加盐酸3mL与水适量使溶解成30mL,分取溶液10mL,加盐酸4mL与水14mL,依法检查砷盐,所生成的砷斑与标准砷溶液(每1mL相当于1μg的As)制成的标准砷斑比较不得更深,标准砷溶液的取样量为2ml。试计算阿胶中砷盐限量为多少?
【简答题】阅读理解。 Hi, everybody! Welcome to our newly-opened Richards Cinema Bookstore! Now let me introduce to you some of the new film books in our store. Are you Chinese film fans? OK, here comes the latest 25...