分光光度标准星
spectrophotometric standard
白光折光计
white light refractometer
折光度调环
dioptric adjkustment ring
4-氨基安替比林分光光度法
4-amino-antipyrine spectrophotometry
4-almido antipyrine spectrophotometry
4-aminoantipyrene spectrophotometric method
721型分光光度计
luodangming b
721 type spectrophotometer