Which have high interactivity, big knowledge density, strong presentation and can well spur learner 's hobby for studying.
具有交互性强、知识密度大、表现力强，能很好地激发学习者的学习兴趣。
The paper expounds in detail the relation between oil density and metering and suggests that it is necessary to propagand metrical knowledge to customers.
详细阐述了油品储存收发过程中密度与计量的关系，并提出了向客户宣传计量知识的必要性。
We propose a method for proving two matrix identities, which are often used in statistical analysis, based on knowledge of conditional posterior density.
提出了用求条件后验密度的方法证明统计分析中的两个矩阵等式的方法。
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