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国际上3G三个标准分别为()。
A. TD-SCDMA
B. W-CDMA
CDMA2000
D. GPRS
To enable faster incremental backups, you enabled block change tracking for the database.Which two statements are true about the block change tracking file?()
A. Multiple change tracking files can be created for a database.
B. The change tracking file must be created after the first level 0 backup.
C. RMAN does not support backup and recovery of the change tracking file.
D. The database clears the change tracking file and starts tracking changes again, after whole database restore and recovery operations.
某垄断竞争厂商的DD’需求曲线与dd’需求曲线在价格为lO美元处相交。这时该厂商的产品价格能否在12美元的水平上达到均衡,为什么?