Identify duty-free items via HS code

engine?Identify duty-free items via HS code The engine is one of the most important components in modern cars. Its main function is to convert chemical energy into mechanical energy to power the car. The working principle of the engine can be summarized in four words: air intake, compression, ignition and exhaust. The cycle of this process is notBreak, constantly mix fuel and air together and ignite them to promote the car movement. The first step is to breathe in. There is an air intake in the front of the engine to allow air to enter the engine from the outside. This air will pass through an air filter to filter the impurities in the air. An appropriate amount of fuel needs to be added to the air entering the engine. The second step is compression. The mixture of air and fuel is injected into a container called a "combustion chamber", and the space in the container is hydraulically driven up. This will make the mixture more dense, which is a compression step. The process of compressing the mixture will produce high temperature, which is an important prerequisite for the next ignition. The third step is to ignition. The igniter turns on in the closed combustion chamber to generate a spark. This spark ignites the high-temperature mixture generated after compression at a higher temperature.Then, a chain reaction breaks out in the combustion chamber, which will quickly expand the combustion and become a fierce flame. The flame is transmitted to the engine of the car through the nozzle and converts energy into mechanical energy for vehicle movement. The last step is to exhaust. After igniting the mixture, the resulting substance begins to expand in the combustion chamber after generating force. At this time, the hydraulic pressure is falling, and the substance is pushed out of the engine and released out. This step is exhaust, which is also the last step of torque conversion. The working principle of the engine seems simple, but the process is extremely complex and delicate. To make the engine work efficiently and lastingly, it is necessary to combine chemical, physical and mechanical principles organically. Understanding the working principle of the engine can help you better understand the essence of the work of the car and make wiser decisions in the selection, maintenance and repair of the car.The core of the engine is the engine cylinder, which can be divided into single-cylinder, double-cylinder, three-cylinder, four-cylinder, six-cylinder, eight-cylinder or even more according to the number of cylinders. The more cylinders there are, the stronger the capacity of the engine. For example, in supercars, 8-cylinder or 10-cylinder engines are commonly used. The small car is less powerful, and the four-cylinder engine is enough to meet the driving needs. Modern engines have improved a lot in technology. They can use different fuels, such as gasoline, diesel, liquefied petroleum gas, and battery power, which can generate a lot of power even at low speeds. In addition, some specially designed engines, such as turbocharger, use compressed air to further improve the efficiency of energy conversion. Generally speaking, the engine is one of the most important parts of a car. ManageUnderstanding its working principle can help consumers better understand the use, repair and maintenance of cars and other related issues. In the future, with people's increasing attention to environmental issues, the working principle of the engine will develop more in the direction of environmental protection, intelligence and efficiency.

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