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中文摘要：
沿用曝光控制因子的同时，基于抽样原理，引入区分度分布因子，按区分度的分布情况来选取测验中的项目．以lna-N（0，1）为例，Monte Carlo模拟结果表明：该方法在估计精度、效率和安全性等指标上表现得比较优异．
英文摘要：
The exposure-control factors has been followed, at the same time, a discrimination-distribution factor has been introduced. According to the distribution of discrimination, the new item selectisn srategy to balance item usage exposure rate has been proposed. Suppose that lna -N（0, 1 ）and according to Monte Carlo simulation, the results show that the new approach has more preferably performance comparing with other approaches on several assessment indexes.
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