我国古代四大书院是指_______、_______、_______、_______
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下列仪表中那组是连接到飞机的全、静压系统上的：（）.
A. 升降速度表、高度表、空速表
B. 转弯和侧滑仪、空速表、气动式方向陀螺
C. 转弯方向仪座舱高度表、座舱高度变化率表（增压座舱）
D. 座舱高度表、座舱高度变化率表
水体的生物生产力通常以磷化合物的数量和质量而转移。
A. 正确
B. 错误
Consider the following scenario： You have a directory， data， under the disk group tdgroupA. You want to create an alias for one of the data files and you execute the following command： ALTER DISKGROUP tdgroupA ADD ALIAS ’+tdgroupA/data/datafile.dbf’ FOR ’+tdgroupA.231.45678’； Which task would be accomplished by the command？（）
A. The command drops the file +tdgroupA·231.45678.
B. The command physically relocates the file to +tdgroupA/data and renames the file to datafile.dbf.
C. The command creates a copy of the +tdgroupA·231.45678 file and places it in +tdgroupA/data after renaming the file to datafile.dbf.
D. The command creates an alias， datafile.dbf， and places it in +tdgroupA/data and does not remove the +tdgroupA·231.45678 file.
E. The command creates a file， datafile.dbf， in +tdgroupA/data and removes the references for +tdgroupA·231.45678 from the data dictionary views.
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