You issue this statement:ALTER DATABASE BACKUP CONTROLFILE TO TRACE; What does the statement generate?()
A text copy of the control file.
B. A binary copy of the control file.
C. A file containing a SQL statement which will re-create the database.
D. A file containing a SQL statement which will re-create the control file.
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成人红骨髓位于()。
A. 扁骨的密质内
B. 短骨的松质内
C. 颅骨的板障内
D. 某些长骨骨端松质内
E. 髓腔内
()联接器适用于联接载荷平衡或起动频繁的传递的小扭矩的轴。
A. 齿轮
B. 凸缘
C. 蛇形弹簧
D. 弹簧圈柱销