The pit cover should be sealed over with tar paper or plastic.
顶盖必须用焦油纸或塑料封闭。
This paper gave an example of anatomy and study of unknown compound in black tar.
本文列举了黑色焦油中未知物的剖析研究实例。
The main objective of this paper is study on catalytic removal of tar.
本论文以生物质焦油的催化脱除为研究目的。
The main objective of this paper is study on catalytic removal of tar.
本论文以生物质焦油的催化脱除为研究目的。
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