It challenges the old concept that coal-derived oil, condensate and some light oils do not emit fluorescence.
否定了认为煤成油、凝析油及部分轻质油不发荧光的观念。
2
The competitiveness of coal-derived natural gas lies in the use of low-price, low-quality coal and technologies needed are coal gasification and methane production techniques.
其竞争力主要源于可采用低价劣质煤，需要选择的主要是煤气化及甲烷化技术。
3
For effective desulfurization and deashing of high-sulfur coal with its use of usual magnetic separation device, a surface magnetism enhancement of coal-derived minerals is a new key technology.