The primary coverage includes: the characters and the detailed process of the problem-based learning model, the experimental study and the teaching suggestion on it.
主要内容包括：问题导向学习模式的特征，具体操作流程，实验研究和教学建议。
The fourth part constructs the model of problem-solving based learning of chemistry, and discusses its meaning, its modeling, its characters, and its teaching and learning strategies.
第四部分是对基于问题解决的化学学习模式的构建，从基于问题解决的化学学习的涵义、模型构建、学科特点、教学策略和学习策略五个方面进行了论述。
Thus, combined with research results of statistic learning theory, the optimal regress model based on least-absolute criteria, or LaOR model was proposed to solve the problem.
为此，结合统计学习理论的研究成果，建立了基于最小一乘准则的最优回归模型，并将其应用于商业银行的信贷风险评估中。
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