At 14:18 on December 10, 2019, when Chen Demin, a metrological calibrator, checked the annual calibration data of Shimadzu and Sino foreign spectrophotometers in room ws05 5613, he found that the displayed value error of 3027 wavelengths was 5.86, which did not meet the requirements of ≤± 5.0. Under investigation<br>
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