The reagents used in bacterial Gram staining are ( ). A: Crystal violet B: Iodine solution C: Ethanol D: Safranine

In paraffin section preparation, which of the following chemical reagents is used in the process of dehydration? A: Fixatives B: Ethanol C: Xylene D: Paraffin

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.

The sequence of reagents used in Gram staining is () A: Safranin solution → iodine solution → alcohol →<br/>crystal violet B: crystal violet → alcohol → iodine solution → Safranin<br/>solution C: Crystal violet → iodine solution → alcohol → Safranin<br/>solution D: Safranin solution → alcohol → crystal violet → iodine<br/>solution E: Safranin solution → crystal violet → iodine solution →<br/>alcohol