设两个关系C和SC如下,它们的主键分别为C#和(S#,C#),在关系SC中除属性 G

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问题:

设两个关系C和SC如下,它们的主键分别为C#和(S#,C#),在关系SC中除属性 GRADE的数据类型是整型,且允许空值外,具他属性的数据类型都是字符型。若要向关系SC执行插入操作,下面给出的4个元组中哪一个元组可以被插入

A.('003001'.C2.null)

B.('004010','C1',90)

C.(003089,C1,'83')

D.('007345','C2',65)

考点:计算机等级考试数据库技术计算机三级(数据库技术)31
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一位厂长,59岁,体胖,伴有轻度高血压,曾做心电图示ST段低平,近日来常在饭前感觉心慌,出汗,似有饥饿感,应考虑的诊断是()。

A.心绞痛

B.神经官能症

C.更年期

D.胰岛素瘤

E.糖尿病

题型:单项选择题

“语言平易、通俗,交流具有互动性”,这是()的特点。

A.批答函

B.总结

C.讲话稿

D.市场调查报告

题型:单项选择题

This is offered as a textbook illustration of the principle that voters are far shrewder than most politicians believe. This case study highlighting Washington’’s inability to fool anyone is based on a recent survey of the attitudes of people on Medicare about their new prescription-drug benefit.Last fall, when Congress added prescription-drug coverage to Medicare, the new law was hailed as a political masterpiece. Congressional Democrats, who overwhelmingly opposed the bill, thundered that they, too, were eager to provide a drug benefit under Medicare, but they championed alternative legislation that offered a larger drug subsidy and smaller incentives to health insurers to participate. Liberals such as Sen. Edward Kennedy were confident that the drug bill, with plenty of holes in its benefit formulas, would inevitably be expanded around the time it took effect.Not many in Congress seemed troubled that the federal budget was deep in deficit, the nation was saddled with future expenditures for the Iraq war and virtually no health care expert believed that the legislation would fit into its projected $400-billion-over-10-years cost framework. The new law was a cynical bargain that had more to do with the 2004 election than a rational approach to the prescription-drug needs of the nation’’s elderly.The prescription-drug legislation seems a compromise between competing ideologies inserted into a fixed congressional budget. Put another way, it was sausage-stuffing in the guise of lawmaking. And, what no one anticipated was the reaction of the elderly, a group that votes in disproportionate numbers.

According to the text, some health care experts believed that .

A.the new law had a 10-year budget of about $400 billion but little was expected for the prescription-drug coverage

B.the new law will have to wait another 10 years and cost about $400 billion before it is able to take effect

C.the framework of the new legislation would be fit for a project that was to cost $400 billion over the next 10 years

D.the projected $400-billion-over-10-years cost framework was planned to be the budget for the current Iraq war

题型:单项选择题

如果40岁的卡波里是伯里克利时代的雅典普通公民,那么他可能()①见证民主派领袖伯里克利连任首席 * * ②在公民大会上行使发言权和表决权③领取参加国家政治事务的津贴④被选举出任“陪审法庭”的法官

A.①②③④

B.①②④

C.①③④

D.②③

题型:单项选择题

未代偿的代谢性酸中毒()

A.pH正常

B.AB=SB,且等于正常值

C.AB

D.AB=SB且均减少

E.AB=SB且均增加

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