有3个关系R、S和T如下图所示。
过运算得到关系T，则所使用的运算为()。
A. 并
B. 自然连接
C. 笛卡儿积
D. 交
查看答案
In the last paragraph, the author uses which of the following in making his point？
A. Comparison and contrast.
B. Definition of terms and classification.
C. Metaphor and simile.
D. Rhetorical question and specific example.
The author would most likely agree with which of the following statements？
Advertising is responsible for compulsive shopping disorder.
B. Pharmaceutical companies counteract the effects of advertisers who persuade Americans to binge buy.
C. Pharmaceutical companies are to blame for compulsive shopping disorder.
D. Pharmaceutical companies are every bit as marketing-oriented as advertisers.
There is no fee for a stop payment order.
A. True
B. False
在推出理财产品的时候,商业银行可以无条件地向客户承诺高于同期储蓄存款利率的保障收益率,这也是维护银行收益的通行做法。()
A. 正确
B. 错误
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