oil tree Data released by the American petroleum institute (API) showed that U.S. crude oil inventories fell 5.2 million barrels in the week ended Dec. 15, down from an expected 35.18 million barrels. Refinery inventories fell more than expected, while gasoline inventories rose, but were less than expected. The overall API data is good and good for oil prices. The accounting income follows the historical cost principle and the matching principle, which is conducive to the objective reflection of the business management responsibility of the enterprise management authorities. But, due to the historical cost principle inherent defects, especially according to the present value of revenue and expenses by historical cost line, makes the calculation of accounting earnings lack of inner logical unity, and the matching principle is difficult to carry out, so that the book value of assets can not reflect its real value, cost cannot be fully compensated. And the economic benefit is measured in the current value, which reflects the actual value of the asset, which is beneficial to the full compensation of the cost. It is a leading enterprise in the domestic fluorine chemical industry, and the recovery of refrigerant is conducive to the improvement of the company's performance. The new material and the electronic chemicals business continue to advance, this time together the big fund will accelerate the company electronic chemical material localization progress. We maintain the forecast of 0.53/0.62/0.71 per cent EPS for 2017-2019 and maintain a "buy" rating. Euroglaze trade customers are seeing returns on the company’s ongoing marketing investment, with leads generated now being distributed directly to them. It doesn't seem to be too much of a market to really focus on learning or learning about the importance of learning. More and more, I feel that learning is to keep to the only way to do it for a long time in the market, continuous learning can bring something new to you constantly, in a sense, the ability of learning will be able to represent your trading ability and analysis ability.