[单选] You issued the following command： ALTER DATABASE ENABLE BLOCK CHANGE TRACKING； What will be the result of issuing this command？（）

A . The block change tracking feature is enabled， and the information about the system change number is written in the change tracking file.
B . The block change tracking feature is enabled， and the information about the log sequence number is written in the change tracking file.
C . The block change tracking feature is enabled， and the information about the blocks that are changed since the last backup is written in the change tracking file.
D . The block change tracking feature is enabled， and the information about the locations of the datafiles and the online redo log files are written in the change tracking file.

Given a class Repetition: Which code should be inserted at line 1 of Demo.java to compile and run Demo to print "pizzapizza"?（） import utils.*;。 static import utils.*;。 import utils.Repetition.*;。 static import utils.Repetition.*;。 import utils.Repetition.twice();。 import static utils.Repetition.twice;。 static import utils.Repetition.twice。南水北调工程总体规划是分别从长江的下游、中游和上游调水约（）亿m3。 450。 530。 275。 480。应退出电压互感器摇测绝缘的情况是（）。高压侧两相熔断器熔断。低压侧熔断器熔断。低压侧两相以上熔断器熔断。采用矿渣水泥拌制的大体积混凝土的浇水养护时间不得少于（）日。 7。 14。 15。 21。 Which command is used to open the database after an incomplete recovery？（） alter database open。 alter database open repairlog。 alter database open resetlogs。 alter database open resetlog。 alter database resetlogs ope。 You issued the following command： ALTER DATABASE ENABLE BLOCK CHANGE TRACKING； What will be the result of issuing this command？（）

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[单选] You issued the following command： ALTER DATABASE ENABLE BLOCK CHANGE TRACKING； What will be the result of issuing this command？（）

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