The geomorphologic features and distribution of sediment type of Qinzhou drowned-valley-bays are systematically introduced in this paper.
本文系统地介绍了广西钦州湾溺谷湾地貌特征和沉积物类型分布。
The synthesis methods of resorcinol were introduced systematically in this paper, and the summary comments for every means were made.
系统介绍了间苯二酚诸多的合成方法，并对其中的磺化法、异丙苯法、芳化法和取代法进行了简要的评述。
Research status and developing prospect of spot welding butt strip is systematically introduced in this paper.
系统地介绍了点焊拼接板的研究现状和发展前景。
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