One employee becomes depressed and lonely, and feels isolated from group activities and social events. According to Maslow, which category of needs has not been fulfilled?
A.
Esteem needs.
B.
Safety needs.
C.
Social needs.
D.
Physiological needs.
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【单选题】在 DIALOG 系统的检索中 , 如果希望检索词 A 和检索词 B 在记录中前后相邻 , 并且词序不能颠倒 , 应该使用哪个位置算符( )。