Jack is one of the most simple lifting equipment with lifting height of less than 1 m, using jacking rigidity as a working device, through the top bracket or hold claw in the schedule at the bottom of the light and small lifting heavy lifting equipment.Divide into two kinds, mechanical and hydraulic jack is mainly used in mines, transportation and other departments as vehicle repair and other lifting, support, etc.The structure light and strong, flexible and reliable, one man can carry and operation.
Jack is divided into mechanical jacks and hydraulic jack, principle is different. In principle, the principle of hydraulic jack is based on PASCAL's principle, namely: the liquid pressure is the same everywhere, so, in a balanced system, the smaller piston top pressure is small, and the big pressure on the piston is bigger, it can keep the liquid stationary. Through liquid, so can be different on the different pressure, so that you can achieve the goal of a transformation.We are common to the hydraulic jack is to use the principle to achieve the force transfer.Mechanical jacks, using mechanical principle, in the past after pull (handle, claw namely rotary driving ratchet clearance, pull small bevel gear drive big bevel gear, make weight lifting screw rotation, so that the lifting socket for lifting or falling, and achieve the function of the lifting force. But not as easy hydraulic jack.
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The previous day, the final of the FAW Jiefang Marketing Skills Competition and Awards Ceremony was held in Changchun. At the award ceremony, Zhang Bing, general manager of FAW Jiefang Automobile Sales Co., Ltd., spoke highly of this competition. Zhang Bing said that the professional skills of the players have provided a strong impetus for the liberation of the marketing foundation. 
Zhang Bing said: "To liberate a strong product's hard power, we must have excellent marketing soft power to match it in order to achieve greater success. This competition not only enables liberated marketers to be more standardized and professional in the process of serving customers. It also led Liberation to take the lead in the commercial vehicle industry to form effective solutions for users to provide operational solutions. Through the training and assessment of competitions, the players returned to work positions and can choose a professional vehicle for the user more professionally. Provide users with more efficient services and vehicle protection.†
At the finals, the participants set up theoretical knowledge competitions, scene drills and practical operations. The three-component competition participants showed their style. They are familiar with the characteristics and advantages of various types of models, confident, thoughtful, skilled, superb skills and practical performance to allow the audience to feast on their eyes, but also received a high degree of approval of the examiner.
It is understood that this year's FAW Jiefang Marketing Skills Contest, three events at the same time, specifically covering the three aspects of sales skills, service skills and maintenance skills. After more than 10,000 people participated in the training of all the skills, after experiencing more than five months of fiery competition, the three national top 10 have finally surfaced.