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【多选题】
在数据库系统中,不是保证数据及语义正确和有效的功能是 ( )A.
并发控制
B.
存取控制
C.
安全控制
D.
完整性控制
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【单选题】Your answer to Question 1 is ______.
A.
Because the technology is evil.
B.
Because the technology is fictional.
C.
Because it is still too early to use the technology.
D.
Because many scientists have failed in using the technology.
【单选题】Please give your answer.
A.
By using the clean cloth.
B.
By using the detergent spray.
C.
By using the inert gas.
D.
By using the compressed air.
【单选题】下列关于财务报表中的各个项目的关系,说法错误的是( )。
A.
资产=负债+所有者权益
B.
流动资产=流动负债
C.
净利润=息税前利润-利息费用-税费
D.
净现金流量=经营活动产生的现金流量+投资活动产生的现金流量+筹资活动产生的现金流量
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