Hybrid cars are so fuel efficient, why can't they be bought?

Because of the high cost, the price will still be higher than that of gasoline cars. Because the saved gas money can't cover the extra cost of buying a car, and the later maintenance cost is one more, the sales of hybrid cars are still limited.

The working principle of hybrid electric vehicle is that it is equipped with two kinds of power sources at the same time-thermal power source (produced by traditional gasoline engine or diesel engine) and electric power source (battery and motor).

Using motor in hybrid electric vehicle can flexibly adjust the power system according to the actual working conditions of the whole vehicle, and at the same time, the engine keeps working in the area with the best comprehensive performance, thus reducing fuel consumption and emissions.

EMU is short for EMU. It relies on electricity as power, and each car can run independently. The earliest is CRH2, which is a high-speed train with a speed of 200 kilometers per hour. On April 18, 2007, when the China Railway was speeding up, the EMU had been put into operation.

The bullet train CRH3 with a speed of 350 kilometers per hour has been running on the intercity railway from Beijing to Tianjin, and the whole journey takes only 27 minutes.

There are four rolling stock companies that produce multiple units in China, namely Sifang Rolling Stock Co., Ltd. in Qingdao, Shandong Province, Tangshan and Changchun buses of CNR, and Puzhen in Nanjing.