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问题 单项选择题

数据库管理系统有3个主要成分，分别是

A．存储管理器、缓冲区管理器和事务管理器

B．存储管理器、查询处理器和恢复管理器

C．存储管理器、查询处理器和事务管理器

D．缓冲区管理器、查询处理器和并发控制管理器

答案

参考答案：C

解析： 数据库管理系统包括以下3个主要成分：存储管理器、查询处理器和事务管理器。

单项选择题

设计阶段要处理好投资、质量、进度三者之间的关系，其中( )是最重要的。

A．投资

B．质量

C．进度

D．投资和进度
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单项选择题

The "Karat" marking on jewelry tells you what proportion of gold is mixed with other metals, ff 14 parts of gold are mixed with 10 parts of base metal, the combination is called 14-Karat (14K) gold. The higher the Karat rating, the higher the proportion of gold in the object. The lowest Karat gold that can be marketed in the United States is 10-Karat gold. Jewelry does not have to be marked with its Karat quality, but most of it is. ff there is a Karat quality mark, next to it must be the U.S. registered trademark of the person or company that will stand behind the mark, as required by the National Gold and Silver Stamping Act.

if the jewelry is marked 14 parts of gold mixed with 10 parts of base metal it will always bear

A．a 14K mark.

B．a 10K mark.

C．an 18K mark.

D．a platinum mark.
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