- double beam photometer
- 双: two; twin; both; dual
- 光束: light beam a surname
- 光度计: photometer; photometric rece ...
- 双光束光栅分光光度计: double beam grating spectrophotometer; double beam grating spectrophotometre; double-beam grating spectrophotometer; double-beamgrating ectrophotometer
- 光束光度计: double beam photometer
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