单项选择题
A.Cr吸收359.35nm，发射357.87nm B.Pb吸收283.31nm，发射283.31nm C.Pb吸收283.31nm，发射405.78nm D.In吸收377.55nm，发射535.05nm
A.A B.B C.C D.D
A.It requires only very small quantities of a sample B.It requires metal.ions in aqueous solution C.It does not produce background emission like a flame D.It does not get hot like a flame