分布式数据库系统有哪些突出特点?
①数据独立性,除了传统的逻辑独立性和物理独立性之外,还具有分布独立性。②集中和自治相结合的控制结构。③适当增加数据冗余度。④全局的一致性、可串行性和可恢复性。
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
Humans,like other animals,interact through ( ) behavior by means of signs or symbols used conventionally. (communicate)
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