下列哪一条不属于数据库设计的任务( )A．设计数据库应用结构 B．设计数据库概论结

按照嵌入式衍生品的属性不同，结构化金融衍生产品可分为股权联结型产品、利率联结型产品、汇率联结型产品、商品联结型产品等种类。 ( )

For many people today, reading is no longer relaxation. To keep up their work they must read letters, reports, trade publications, interoffice communications, not to mention newspapers and magazines: a never ending flood of words. In (1) a job or advancing in one, the ability to read and comprehend (2) can mean the difference between success and failure. Yet the unfortunate fact is that most of us are (3) readers. Most of us develop poor reading (4) at an early age, and never get over them. The main deficiency (5) in the actual stuff of language itself—words. Taken individually, words have (6) meaning until they are strung together into phrases, sentences and paragraphs. (7) , however, the untrained reader does not read groups of words. He laboriously reads one word at a time, often regressing to (8) words or passages. Regression, the tendency to look back over (9) you have just read, is a common bad habit in reading. Another habit which (10) down the speed of reading is vocalization—sounding each word either orally or mentally as (11) reads.
To overcome these bad habits, some reading clinics use a device called an (12) , which moves a bar(or curtain) down the page at a predetermined speed. The bar is set at a slightly faster rate (13) the reader finds comfortable, in order to "stretch" him. The accelerator forces the reader to read fast, (14) word by word reading, regression and subvocalization practically impossible. At first (15) is sacrificed for speed. But when you learn to read ideas and concepts, you will not only read faster, (16) your comprehension will improve. Many people have found (17) reading skill drastically improved after some training. (18) Charlie Au, a business manager, for instance. His reading rate was a reasonably good 172words a minute (19) the training; now it is an excellent 1,378 words a minute. He is delighted that how he can (20) a lot more reading material in a short period of time.

A．master
B．go over
C．present
D．get through

平均车日行程是以“车日”作为时间单位计算的综合性速度指标，平均车日行程=平均每日出车时间×（）。

A、营运速度

B、完好率

C、技术速度

D、工作率

下列______指标考查的是邮政的服务质量。

A．邮政网点的分布密度
B．准点交邮率
C．重大通信事故次数
D．总包邮件信息发送准时率

分离液态的（）可以获得氧气，该过程属于（）变化。