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【简答题】
视图是从一个或几个基本表导出的表,它与基本表不同,是一个虚表。换句话说,数据库中只存放视图的 ,而不存放视图对应的数据,这些数据仍存放在原来的基本表中。
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反馈参考答案：
举一反三
【单选题】By using more labor to produce more output, a firm can always reduce its
A.
marginal cost.
B.
average variable cost.
C.
average total cost.
D.
average fixed cost.
【单选题】C Too much TV-watching can harm children’s ability to learn and even reduce their chances of getting a college degree,new studies suggest in the latest effort to examine the effects of television on c...
A.
have watched a lot of TV
B.
not be interested ted in math
C.
be unable to go to college
D.
have had computers in their bedrooms
【单选题】Effective sourcing processes within a firm can
A.
improve profits for the firm and total supply chain surplus.
B.
reduce profits for the firm and total supply chain surplus.
C.
reduce total supply chain surplus.
D.
reduce profits for the firm.
【判断题】A high degree of liquidity can enhance the firm’s safety, but an excessive degree of liquidity can reduce the firm’s return.
A.
正确
B.
错误
【判断题】Diversification can reduce a firm's exposure to poor performance in a particular market.
A.
正确
B.
错误
【单选题】By producing less, a firm can reduce
A.
its fixed costs and its variable costs.
B.
its fixed costs but not its variable costs.
C.
its variable costs but not its fixed costs.
D.
neither its variable costs nor its fixed costs.
【单选题】患者男,46岁,因“急性脑出血”入院,护士在巡视时发现,患者出现一侧瞳孔散大,呼吸不规则,此时患者有可能会出现的并发症是( )
A.
动眼神经损害
B.
消化道出血
C.
癫痫发作
D.
脑疝
E.
呼吸衰竭
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