本发明涉及一种用于溅镀式镀膜机台的承载台,其包括:一第一载具及一中空的第二载具。
The invention relates to a bearing platform used for a sputtering type coating machine, which comprises a first bearing tool and a hollow second bearing tool.
空分装置中空压机的防喘振控制是压缩工段的关键,防喘振控制的好坏直接关系到空压机设备的安全,因此空压机控制组态十分重要。
Air compressor Surge proof control is key in compress section in ASU, Surge proof control affect the air compressor itself safety, therefor air compressor configuration is important.
为了实现不完全信息的处理,以关系数据库中空值的完全语义为基础,阐述空值的存在对数据库操作的影响,并给出几种处理空值的方法。
Based on the semantics of null values in relational database, the article analyzes the affection of null values when we operate the database.
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