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【单选题】
保护数据库，防止未授权的或不合法的使用造成的数据泄漏、更改破坏，这是指数据库的（ ）。A.
完整性
B.
并发控制
C.
安全性
D.
数据库恢复
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A.
Hang out with his friends
B.
Invite his friends to fly kites
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A.
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C.
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D.
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【单选题】已知数列{a n }的前n项和 S n = a n -1(a≠0) ，那么数列{a n }（ ）
A.
一定是等比数列
B.
一定是等差数列
C.
是等差数列或等比数列
D.
既不是等差数列也不是等比数列
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