More than 9800 students across the country cheated in the College English Test, both Band 4 and 6, held on December 19, 2009, according to a preliminary estimation.

2009年下半年全国大学英语四六级考试于19日结束，初步统计全国各地共发现违规考生9800多名。

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In this dissertation, we mainly focused on the restricted biased estimation and preliminary test estimation of parameter in linear models with equality restrictions and stochastic linear restrictions.

本文主要是研究线性模型参数在等式约束和随机线性约束下的约束有偏估计以及预检验估计等相关的一些问题。

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Meanwhile the author conducts preliminary exploration on ice jam entrainment sediment concentration, total sediment discharge, sediment transport distance and its estimation method;

对冰凌含沙量、输沙总量、输沙距离的估算方法进行了初步探讨；

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