单项选择题
A.—NH2 B.—COOH C.—NO2 D.—NO
A.molecular structure B.the presence of heavy atoms C.the concentration of the solution D.the temperature of solution
A.用高灵敏度的检测器 B.在稀溶液中测量 C.在最大摩尔吸光系数下测量 D.在最大量子产率下测量