国标规定,二硫腙比色法测定食品中铅,样品经灰化处理后,用于溶解灰分的是() A.硫酸 发布时间:2017-05-14 23:20 │ 来源:www.tikuol.com 题型:单项选择题 问题: 国标规定,二硫腙比色法测定食品中铅,样品经灰化处理后,用于溶解灰分的是()A.硫酸B.硝酸(1+1)溶液C.盐酸D.磷酸E.盐酸(1+2)溶液
题型:单项选择题 — Turn off the TV, Jack. _____ your homework now? — Mum, just ten more minutes, please. [ ]A. Should you be doingB. Shouldn't you be doingC. Couldn't you be doing D. Will you be doing 查看答案