题目内容

生产部门认为产品设计方案难以实施，向设计部门提出改进建议，这种情况属于横向沟通。

A. 对
B. 错

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主要有5种约束，分别是主键约束、唯一约束、外键约束、检查点约束、非空约束。

A. 对
B. 错

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下列属于数据库对象的是（）

A. 表空间
B. 用户
C. 表
D. 段

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2018 年年 12 月大学英语四级考试真题（二）Listening Comprehension (25 minutes)Section ADirections: In this section, you will hear three news reports. At the end of each news report, you will hear two or three questions. Both the news report and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre.Questions 1 and 2 are based on the news report you have just heard.[音频]

A man was pulled to safety after a building collapse.
B. A beam about ten feet long collapsed to the ground.
C. A rescue worker got trapped in the basement.
D. A deserted 100-year-old building caught fire.

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2.

A. He suffered a fatal injury in an accident.
B. He once served in a fire department.
C. He was collecting building materials.
D. He moved into his neighbor’s old house.

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生产部门认为产品设计方案难以实施，向设计部门提出改进建议，这种情况属于横向沟通。

A. 对 B. 错

主要有5种约束，分别是主键约束、唯一约束、外键约束、检查点约束、非空约束。

下列属于数据库对象的是（）

2.

A. 对
B. 错