It is important for pollution control and health security to investigate the pollution level and multi-medium environment processes.
了解海洋环境中PAHs的浓度水平及其多介质环境过程，对防治海洋污染、保障人群健康具有重要意义。
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A newly developed computer aided welding procedure design system and its multi - medium programming environment VB are introduced in this paper.
介绍了新近研制的计算机辅助焊接工艺设计系统和焊接工艺设计系统多媒体可视化集中开发环境VB。
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