加入煤粉主要是为了提高铸铁件的表面质量,防止(),从而提高铸件表面质量。
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横指同身寸法,将食、中、无名指、小指并拢后,以何处横纹为标准,作为3寸()
A. 食指远端指节
B. 中指远端指节
C. 无名指远端指节
D. 食指中节
E. 中指中节
Which three statements are true regarding the use of the Database Migration Assistant for Unicode(DMU)?()
A DBA can check specific tables with the DMU
B. The database to be migrated must be opened read-only.
C. The release of the database to be converted can be any release since 9.2.0.8.
D. The DMU can report columns that are too long in the converted characterset.
E. The DMU can report columns that are not represented in the converted characterset.
网络体系结构和协议标准化的研究开始于20世纪()年代。
A. 50
B. 60
C. 70
D. 80