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What elements of globalization can be explicitly defined using the NLS_LANG environment variable? (Choose all that apply.)
A. NLS_LANGUAGE
B. NLS_SORT
C. NLS_CALENDAR
D. NLS_CHARACTERSET
E. NLS_TERRITORY

　　The client-side NLS_LANG parameter can define language,territory,and character set all at once.Though the value for NLS_SORT is derived from the NLS_LANGUAGE parameter setting,it is not explicitly set by NLS_LANG.NLS_CALENDAR is not affected by the setting of NLS_LANG.

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原文：http://www.cnblogs.com/Babylon/p/7833749.html