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问题 填空题

数据模型是严格定义的一组概念的集合。通常由数据结构、数据操作和______三部分组成。

答案

参考答案：完整性约束

解析： 本题考查数据模型的基础知识。数据模型通常由数据结构、数据操作和完整性约束三部分组成。

单项选择题 配伍题

呕吐物含食物及大量胆汁（）

A.吻合口梗阻

B.输出袢空肠梗阻

C.输入袢慢性不完全梗阻

D.输入袢急性完全梗阻

E.碱性反流性胃炎
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单项选择题

A new study finds that blacks on death row (1) of killing whites are more likely to be executed than whites who kill minorities. It also concludes that blacks who kill (2) minorities are (3) likely to be executed than blacks who kill whites. For example, there is more than a twofold greater risk that an African-American who killed a white will be executed than a white person who kills a (4) victim. A Hispanic is at least 1.4 (5) more likely to be executed (6) such an offender kills a white.

The researchers of the study believe that there are two (7) explanations.. First, prosecutors often win (8) office if they win well-publicized cases. When a black kills a white, such killings gets more (9) and this idea can be (10) by many famous cases. (11) , the court judges at the state level are often (12) to elections, called retention elections. Retention election or judicial retention within the United States court system, is a periodic process, in which the voter (13) approval or disapproval for the judges presently (14) their position, and a judge can be removed from the position if the (15) of the citizens vote him or her out. Just as the researchers (16) out, death penalty is (17) political.

The findings of the study, in short, show that American justice systems clearly (18) white lives more than those of blacks or Hispanics. The researchers also say their findings (19) serious doubts about (20) that the U.S. criminal justice system is colorblind.

4（）

A.nonwhite

B.American

C.foreign

D.minor
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