What is the difference between warning markings and prohibition markings?

What is the reason why the first gear of a manual transmission car cannot be engaged?

Manual transmission car cannot engage the first gear because the first gear teeth of the transmission are severely worn, and replacing a new gear teeth can solve the problem. Manual transmission, also known as manual gearbox, is a type of transmission device, the most basic type in automotive transmissions. Its function is to change the gear ratio, also known as the gear ratio, which uses the principle of leverage to amplify the engine torque with the large diameter gear of the low-speed gear with a longer radius, helping the vehicle to start moving forward. Manual transmission belongs to pure mechanical structure, so increasing the number of gears will inevitably increase the volume and mass, making the increase in gears limited. In contrast, automatic transmissions using planetary gear sets (AT) or steel belts (CVT) can compress the volume with technological advancements, thereby achieving the characteristic of increasing the number of gears without increasing the volume.

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What is the working principle of an oil pump?

The operation of an oil pump is achieved through the reciprocating motion of the plunger. The specific working principle is as follows: The suction and compression of oil by the oil pump are accomplished by the reciprocating motion of the plunger within the plunger sleeve. When the plunger is in the lower position, the two oil holes on the plunger sleeve are opened, connecting the inner cavity of the plunger sleeve with the oil passage in the pump body, allowing fuel to quickly fill the oil chamber. When the cam contacts the roller of the roller body, the plunger rises. Due to the movement of the plunger, fuel is squeezed out from the oil chamber and flows into the oil passage. This stroke is called the pre-stroke. When the plunger blocks the oil hole, the oil compression process begins. As the plunger moves upward, the oil pressure in the oil chamber increases sharply. When the pressure exceeds the spring force of the outlet valve and the upper oil pressure, the outlet valve is pushed open, and the fuel is forced into the oil pipe and delivered to the injector. Maintenance of the oil pump should pay attention to the following aspects: Water can corrode the oil pump, so substances containing water are prohibited from being evacuated by the oil pump. For substances containing a large amount of solvent, first remove most of the solvent in an oven before using the oil pump for evacuation. Use the vacuum pump in the correct sequence to prevent backflow. After using the vacuum oven, be sure to clean it thoroughly, wiping the glass window of the vacuum oven. Wipe off the surface rust-proof oil. Remove the rust-proof oil from the inner cavity of the governor and the inner cavity of the fuel injection pump, and add the specified grade of lubricating oil.

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What are the reasons for a car horn suddenly not working?

The reason for a car horn suddenly not working is contact erosion. If the horn is pressed for a long time, it can easily cause the horn contacts to erode, resulting in a certain impedance that weakens the current flowing through the electromagnetic coil (reducing the electromagnetic attraction). At this point, it will definitely be unable to attract the armature to drive the diaphragm to vibrate normally, leading to a hoarse sound from the horn or even the possibility of it not working at all. The horn is the sound signal device of a car. During the driving process, the driver can emit necessary sound signals as needed and according to regulations to warn pedestrians and alert other vehicles, ensuring traffic safety. It is also used for urging movement and transmitting signals.

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Why is the photo on the driver's license blue?

The photo on the driver's license is not blue, but white. According to the "Road Traffic Safety Law of the People's Republic of China," the photo on the driver's license must have a white background. White, red, and blue background photos are used for the following three types of documents: white background photos are used for ID cards, passports, visas, driver's licenses, etc.; red background photos are used for insurance, medical insurance, IC cards, temporary residence permits, wedding photos, etc.; blue background photos are used for graduation certificates, work permits, resumes, Hong Kong and Macau travel permits, passports, etc. In addition to the background color, there are other requirements for driver's license photos, as follows: No uniforms should be worn, the portrait should be clear, with rich layers, natural expression, and no obvious distortion; The photo size should be 32mm x 22mm, with a head width of 14mm to 16mm and a head length of 19mm to 22mm; The photo can be pasted or digitally printed; The shooting location should be the vehicle management office or a photo studio with a legitimate business license. Both men and women should not wear earrings, and those who need vision correction should wear glasses; Women's hair should not be loose, and men's hair should not be too long; The head should occupy about two-thirds of the photo; Applicants applying for a motor vehicle driver's license or temporary motor vehicle driving permit must provide a front-facing, hat-free, color, half-body ID photo taken within the last 6 months.

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What is the fuel tank capacity in liters for the Mazda CX-4 2.0L?

The fuel tank capacity of the Mazda CX-4 2.0L model is 45 liters. This data is officially released, and owners who have purchased the Mazda CX-4 can also check it on the vehicle's configuration sheet. The Mazda CX-4 2.0L requires 92-octane fuel, with a fuel consumption of 6.3L per 100 kilometers. A full tank of fuel allows for a driving range of approximately 714 kilometers. During daily driving, it is essential to monitor the remaining fuel level in the tank. This is typically observed through the fuel gauge inside the vehicle. Under normal circumstances, the fuel level will be accurately reflected on the gauge. The fuel gauge usually has 5 to 6 segments, and it is advisable to refuel when only 2 segments remain to avoid running out of fuel mid-journey. In actual refueling situations, the amount of fuel filled may exceed the marked capacity. This is because the manufacturer's specified tank capacity is measured from the bottom of the tank to the safety limit, and there is additional space from the safety limit to the tank opening. This extra space ensures that the fuel can expand when temperatures rise without overflowing the tank. If fuel is filled up to the tank opening during refueling, the actual amount of fuel added may exceed the marked tank capacity.

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Which region does the license plate 'Ting' belong to?

Currently, there is no license plate with the designation 'Ting'. License plates are panels mounted on the front and rear of vehicles, typically made of materials such as aluminum, sheet metal, plastic, or paper, and bear the vehicle's registration number, registration region, or other relevant information. License plates serve to number and register vehicle information, with their primary function being to identify the region to which the vehicle belongs and to trace the vehicle's owner and registration details based on the plate. Large vehicle license plates feature black characters on a yellow background with black borders; trailer license plates also have black characters on a yellow background with black borders; small vehicle license plates display white characters on a blue background with white borders; while embassy and consulate vehicle license plates show white characters on a black background with white borders.

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What is the difference between warning markings and prohibition markings?

What is the reason why the first gear of a manual transmission car cannot be engaged?

What is the working principle of an oil pump?

What are the reasons for a car horn suddenly not working?

Why is the photo on the driver's license blue?

What is the fuel tank capacity in liters for the Mazda CX-4 2.0L?

Which region does the license plate 'Ting' belong to?

Is it possible not to be photographed when a vehicle crosses a single yellow line?

Is the Ticking Sound in the Cruze Engine Normal?

How Often Should Semi-Synthetic Motorcycle Oil Be Changed?

What is the reason why the Volkswagen Sagitar does not move when in D gear without pressing the accelerator?