1949年8月27日，成立宁乡县人民政府，第一任人民县长是？
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中国民航PBN规划中期（2013-2016）将在终端区强制使用（）。
A. RNP4或RNAV-2
B. RNAV-1或基本RNP-1
C. RNAV-1
D. 基本RNP-1
开立信用证属于银行一项产生（）的授信业务。
A. 资产
B. 或有负债
C. 负债
D. 或有资产
Which statement is true regarding the Archiver （ARCn） process，archived log files，and recovery？ （）
A database backup, combined with archived redo log files, guarantees that all committed data can be recovered to the point of failure.
B. During recovery the ARCn background process copies its redo entries identified for recovery by the control file to the data files.
C. After each write to an archived log, the mandatory background process ARCn writes its log sequence number and the first and last SCN number within the log sequence to the control file.
D. At database recover time, and archived redo log is uniquely identified for recovery use by its redo thread number and destination ID number retrieved from the control file.
我国的GPS系统由（）颗卫星组成了完整的卫星导航定位系统，确保全天候、全天时提供卫星导航信息。
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