数据挖掘
参考答案：
数据挖掘是通过分析每个数据，从大量数据中寻找其规律的技术，主要有数据准备、规律寻找和规律表示3个步骤。
_____ was known to all, John had broken his promise _____ he would stay with us for some
time. [ ]
A. As; that
B. As; which
C. It; that
D. Which; that
机关根据工作需要，经省级以上公务员主管部门批准，可以对专业性较强的职位和辅助性职位实行聘任制。 ( )
