移频自动闭塞制式的中心频率f0选在干扰谐波的（）上。
某公司向银行借入20000元，借款期为9年，每年的还本付息额为4000元，则借款利率为（）。[已知：（P／A，12％，9）=5．3282，（P／A，14％，9）=4．9464]
A. 13.06％
B. 13.72％
C. 15.36％
D. 16.5％
在我国法定计量单位中，重量是质量的俗称，它的符号是kg。
A. 正确
B. 错误
You executed the following command: RMAN> RECOVER COPY OF DATAFILE '/u01/app/oracle/oradata/orcl/users01.dbf'; Which statement regarding the above command is correct?（）
A. The '/u01/app/oracle/oradata/orcl/users01.dbf' data file is recovered from the image copy
B. The '/u01/app/oracle/oradata/orcl/users01.dbf' data file is recovered from the last incremental backup
C. Image copies of the '/u01/app/oracle/oradata/orcl/users01.dbf' data file are updated with all changes up to incremental backup SC'/ u01/app/oracle/oradata/orcl/users01.dbf
D. Image copies of the '/u01/app/oracle/oradata/orcl/users01.dbf' data file are recovered using the above command if data file recovery fail
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