The beaker shown is a nitrogen oxide analysis: It is known from the title that if the indication of the spring scale is first reduced and then enlarged, the magnetism of the electromagnet must first become weaker and then become stronger. According to the analysis of the factors affecting the magnetic strength of the electromagnet, the magnetic strength of the electromagnet is only related to the current intensity through the solenoid when the number of solenoid turns is constant and there is a core. According to the analysis, the strength of the current in the circuit is determined by the conductivity of the solution, and the conductivity of the solution depends on the freely moving ion concentration in the solution. The higher the ion concentration, the stronger the conductivity. Otherwise, the conductivity of the solution changes. weak. Therefore, the reagent to be added should have a condition capable of reacting with the cesium hydroxide solution and the resulting product is difficult to ionize. The solution in (A), (C), (D) and the cesium hydroxide solution react to form TBaCI: NaOH, Ba (NO3), etc., which can ionize the ions, and the conductivity in the title is weakened first. If the strength does not match, only the addition of any of the solutions of group (B) will produce water-insoluble barium sulfate, barium carbonate and hardly ionized water, so that there is almost no free-moving ions in the solution. Therefore, with the addition of dilute sulfuric acid or carbonic acid, the number of ions in the solution is reduced when the two are completely reacted; if dilute sulfuric acid or carbonic acid is continuously added, the H, 50, or CO ions in the solution gradually increase. Conductivity began to increase again. Therefore, only when adding any one of dilute sulfuric acid and carbonic acid, the display of the spring balance will be smaller first and then larger. Comments: The above three questions are all physics and chemistry questions based on the change of scales. In order to solve such exercises smoothly, it is necessary not only to master the chemical knowledge such as the reaction law between acid, alkali and salt solution and the law of metal displacement reaction; but also to master and flexibly apply the relationship between buoyancy and liquid density of objects. And the knowledge of the force analysis of the object and the factors affecting the magnetic strength of the electromagnet. Objects weighing 100 cows are placed on a horizontal table and stand still. At this time, the pressure on the object on the table is N-10 cattle, and the gravity of the object is also 100 cattle. Relational different pressure relationship: (1) f-production N. This is the relationship between friction, roughness of contact surface and positive pressure. In the case where the roughness of the contact surface is constant, the friction is proportional to the magnitude of the pressure. (Static friction should be analyzed separately).
Roller shutter door , also known as "shutter door", lots of panel pieces connected together, fixed in the guide rail , take above reel as the center of rotation.
Roller shutter door is used for commercial facades, garages, shopping malls, hospitals, factories and mines and other public places or residential.Electric roller shutter door, especially for large openings, inconvenient to install the ground door , quick opening effect. Such as for the garage door, shopping mall fire shutter door.
Opening methods: Handing driving mode
Rope driving mode
Remote control driving mode
Electric switch driving mode
Roller Shutter Door,Galvanized Roller Shutter Door,Aluminum Roller Shutter Door,Transparent Roller Shutter Door Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hffastdoor.com