都是出賣，賣給中原各國也可以，何必非要賣給越國呢？?
煤炭行業(yè)必須依靠技術(shù)發(fā)展來可持續(xù)地滿足全球能源需求
Quality is remembered long after price is forgotten.
The core of technological innovation is to solve practical problems, not to innovate for the sake of innovation.