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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。
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.
选择优化的条件制备了球形氧化铝载体，其物化性能与工业载体相当，用其制备的催化剂的催化性能达到了工业催化剂的水平。
Spherical support and catalyst prepared under the optimum conditions in lab exhibited similar physicochemical properties and catalytic performance as compared with the commercial support and catalyst.
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