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
参考答案:B
_______ Lucy were not given timely treatment, she would suffer from a cough for the rest of her life shocked her parents.
A.That
B.If
C.That if
D.If that
波特五力分析包括哪些要素?