The coverage of BeO on the specimen surface came from the preferential oxidation of beryllium due to the occurrence of residual oxygen in the vacuum system.
氧化铍在表面的覆盖来源于真空中残余氧气在样品表面的化学吸附，从而导致了铍的择优氧化。
2
To distribute the daily BEO and weekly forecast to each department.