高考问答中石化的油卡丢了:我 找翻译?
来源：百度文库 编辑：高考问答 时间：2024/07/08 13:07:40
Seeing from the picture showing media movement inside mil1,media do the circulation movement surrounding the packing center M (Fig．4)．M is regarded as the center point of whole media and media are divided into several hol1ow arc layer with the layer thickness of h．