Hybrid cars, which add an internal combustion engine to pure electric vehicles, aim to reduce the pollution of cars and improve the mileage of pure electric vehicles. Hybrid vehicles have serial and parallel structure. Mehrotra said the additional rate for PC flash drives in 2017 is about 35 percent, and will increase to 75 percent by 2020. And "a lot of hard drives still need to be replaced by SSDS... Future self-driving vehicles are expected to be equipped with about 40GB of DRAM... This will also drive the use of NAND flash memory." With the real success of the trump tax reform bill, investors in the short term focus more on whether the market has already digested this benefit. In the early hours of Wednesday, crude oil inventories were down (though gasoline inventories rose), boosting U.S. oil prices, according to zero hedge, a leading financial blog. But oil inventories in the EIA fell by five weeks, while gasoline inventories rose in six weeks and oil prices were volatile. In addition, us crude oil output was at a record high. Currently, us oil is trading at $57.56. The oil was trading at $63.95, up 0.25%. The investment in securities is conducive to improving the operation and management of enterprises, improving the economic and social visibility of enterprises and promoting the rationalization of enterprises' behaviors.