Coal tar processing is one of the most important areas of coal chemical technology and a main intermediatering binding coal mining, metallurgy and chemical industry.
煤焦油加工是煤化工的重要内容之一，与煤炭、冶金和化工等行业密切相关，在世界范围内已有相当规模。
2
The pump comprises mainly of pump body, cover, impeller, shaft, seal ring, intermediate support, sealing and suspension assembly, etc.
泵主要由泵体、泵盖、叶轮、轴、密封环、中间支架、密封和悬架部件等组成。
3
The intermediate dye can then undergo an acid catalyzed ring opening to produce a colored dye form.