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问题 问答题 简答题

辗轧角是什么？

答案

参考答案：

轧辊轴线与轧制线在轧制主平面上的投影的夹角。（轧辊轴线和轧制线两者在包含轧制线和轧辊调整回转中心到轧制线的垂直距离在内的平面上投影的夹角。）

计算题

（8分）中子星的质量大约与太阳的质量相等，为2Kg，其半径为10Km.（已知G=6.67N·m2/Kg2，要求结果保留两位有效数字）求：

（1）此中子星表面的自由落体运动的加速度？

（2）绕中子星做圆周运动的小卫星的最大运行速度是多少？
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单项选择题

Generally, data mining (sometimes called data or knowledge discovery) is the process of analyzing data from different perspectives and (1) it into useful information information that can be used to increase revenue, (2) costs, or both. Data mining software is one of a number of analytical tools for analyzing data. It (3) users to analyze data from many different dimensions or angles, categorize it, and summarize the relationships identified. Technically, data mining is the process of finding correlations or patterns among dozens of fields in large relational databases.
Although data mining is a (4) new term, the technology is not. Companies have used powerful computers to sift through volumes of supermarket scanner data and analyze market research reports for years. However, continuous innovations in computer processing power, disk storage, and statistical software are dramatically increasing the accuracy of analysis while driving (5) the cost.

(5)

A．away

B．into

C．back

D．down
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