coal tar 是什么意思

a tar formed from distillation of bituminous coal; coal tar can be further distilled to give various aromatic compounds

Coal tar is a brown or black liquid of extremely high viscosity. Coal tar is among the by-products when coal is

	1.	The chemist reported on his experiments with coal tar . 化学家提出他实验沥青的报告。
	2.	Test method for ash in coal tars and pitches 测试煤焦油和硬沥青中灰分的试验方法
	3.	Method for preparation of coal tar pitchs specimens 煤沥青试验室试样的制备方法
	4.	Standard specification for creosote - coal tar solution 杂酚油-煤焦油溶液的标准规范
	5.	Coal tar base oil - terminology ; german version en 12303 : 2000 煤焦油基油.术语
	6.	Specification for coal tar creosote for wood preservation 木材防腐用煤焦杂酚油规范
	7.	Extraction of xylenol from low temperation coal tar 低温焦油中二甲酚的提取
	8.	Method for determination of coal tar pitch ash content 煤沥青灰分测定方法
	9.	Standard test method for ash in coal tar and pitch 测试煤焦油和硬沥青中灰分的标准试验方法
	10.	Determination of coal tar and dust of gas in urban area 城市燃气中焦油和灰尘含量的测定方法

coal tar是什么意思