This article starts out from the characteristics of self-directed distance learning, analyze the definition, characteristics and the core of compositions in the end...
本文从远程自主学习的特征出发，对远程自主学习的涵义、核心要素进行了分析，并对与远程自主学习易混淆的几个概念进行了辨析。
The organic carbon contents, compositions and distributions of various biomarker compounds were examined in leg NS90-103 of marine sediment core from chinese Nansha sea areas.
研究了南沙海域NS90—103柱样有机碳含量、各类生物标志化合物的组成和分布及其地球化学意义。
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