In UV-Vis spectrophotometry, the source for UV radiation is () A: Tungsten lamp B: Globar C: Hollow cathode lamp D: Deuterium lamp

When<br/>the substance is measured by atomic absorption spectrophotometry, the<br/>state of the substance is ( ) A: Solid<br/>state B: Liquid C: Vapor<br/>state D: Supercritical<br/>state

In the determination of UV-vis spectrophotometry, the function of reference solution is ( ). A: Adjust the zero point of the transmittance of the instrument. B: Absorb the light wave needed in the determination of light. C: Adjust the intensity of the incident light. D: Eliminate the influence of all substances other than the substances to be measured such as reagents on incident light.