What Causes a Car's Air Conditioner to Blow Cold Air Instead of Heating?

How Many Attempts Are Allowed for the Driving License Subject 1 Exam?

The "Regulations on the Application and Use of Motor Vehicle Driving Licenses" clearly stipulate that on the day of the Subject 1 exam, candidates can take the test twice. If the first attempt is unsuccessful, a second free retake is allowed. If the second attempt also fails, the Subject 1 exam for that day is terminated, and the candidate must wait ten days before scheduling another exam. Subject 1, also known as the theoretical driving test or driver theory test, is part of the motor vehicle driving license assessment. The exam content includes the theoretical basis of driving, road safety laws and regulations, local regulations, and related knowledge. The test is conducted on a computer with a time limit of 45 minutes. A passing score for the Subject 1 exam is 90 out of 100, with the test consisting of 100 questions, including single-choice and true/false questions, each worth 1 point. If a candidate answers 11 questions incorrectly during the exam, the system will automatically submit the test and end the session. Subject 1 exam content: Driving license and motor vehicle management regulations; Road traffic conditions and regulations; Road traffic safety violations and penalties; Road traffic accident handling regulations; Basic knowledge of motor vehicles; Local regulations; Knowledge of braking systems and safety devices for large and medium-sized passenger and freight vehicles; Specialized knowledge for wheeled self-propelled machinery, trams, and trolleybuses. Subject 1 exam precautions: Candidates should dress appropriately for the exam, no slippers are allowed, and electronic devices and bags are prohibited in the exam hall. Bring your ID card and queue to enter the waiting area. Observe the instructions and procedures on the large screen, and store personal belongings in lockers before entering the exam hall. Upon entering the exam hall, candidates will be assigned a seat at the identity verification station. After finding your seat, begin the exam. Ensure the camera is aligned with you and adhere to exam discipline. If you fail the first attempt, a retake is available on the same day. If you fail again, you must pay to reschedule. After the exam, queue to collect your score report and sign it. Without a signature, the result is invalid. There is no limit to the number of times you can schedule the Subject 1 exam. Each subject allows one exam attempt, with one retake if you fail. If you do not take the retake or fail the retake, the exam session is terminated, and the applicant must reschedule. For Subject 2 and Subject 3, only five exam attempts are allowed. Subject 2 and Subject 3 exams must be scheduled ten days later. If you fail the Subject 3 safe driving knowledge test, the previously passed road driving skills test results remain valid. There are three subjects in the driving test: Subject 1, Subject 2, and Subject 3. Subject 1 refers to the road traffic safety laws, regulations, and related knowledge test; Subject 2 refers to the field driving skills test; Subject 3 is divided into two parts: road driving skills and safe driving knowledge test. The safe driving knowledge test is conducted after Subject 3, so it is commonly referred to as Subject 4. However, the official term (as per the Ministry of Public Security's Order No. 123) does not include "Subject 4."

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Where is the QR code for motor vehicles?

The QR code for motor vehicles is located at the bottom left corner of the front windshield, and in some cities, it is also found on the license plate. The QR code contains license identification information such as the issuing authority, unique serial number, and license plate number, as well as technical parameters of the vehicle and owner information. Only internal traffic police equipment can scan the QR code; ordinary mobile phones cannot recognize the QR code on the license plate, preventing the leakage of personal information. The specific application of QR code vehicle management involves the management of vehicle information, safety, inspection, and approval. As a means of transportation, vehicles and their drivers are constantly in dynamic motion through time and space.

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How to Turn On the Rear Speakers in a Car?

To activate the rear speakers in a car, simply press the corresponding speaker button. Here is a detailed introduction to car audio systems: 1. Overview: Car audio systems are designed to alleviate the monotony of travel for drivers and passengers by providing radio and playback functions. 2. Components: A car audio system mainly consists of three parts: the head unit, speakers, and amplifier. Among these, the head unit is the most crucial component. 3. Development: The earliest car audio systems used AM radios, which later evolved to include AM/FM radios, cassette players, and eventually CD players compatible with DCC and DAT digital audio formats.

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What is the function of the valve spring?

The function of the valve spring is to overcome the inertial force of the valve and its transmission components during the valve closing process. Below are the relevant details: 1. Purpose: To prevent gaps between transmission components caused by inertial forces, ensuring the valve promptly seats and tightly fits, preventing valve bouncing during engine vibration, which could compromise its sealing. 2. Tool introduction: The valve spring is located between the cylinder head and the spring seat at the tail end of the valve stem. The function of the valve spring is to ensure the valve tightly fits with the valve seat or valve seat ring when closed, and to overcome the inertial force generated by the valve train during valve opening, keeping the transmission components always under cam control without disengaging from each other.

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Where to Place the Vehicle Annual Inspection Sticker?

Car annual inspection stickers should be placed in the upper right corner of the front windshield. Below are some precautions for new car annual inspections: 1. Keep it clean: Wash your car before the inspection to maintain a clean exterior appearance. It's best to clean the engine area under the hood as well, ensuring the staff can clearly see the engine number and chassis number. 2. Pay attention to decals: Stickers on the front windshield can obstruct the driver's view. Large decorative decals on the car body or eye-catching club logos are considered unauthorized modifications to the vehicle's appearance and will cause the inspection to fail. 3. Regular maintenance: Regular maintenance is also crucial. Many car owners neglect maintenance, leading to excessive exhaust emissions.

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What is the current of a car battery?

Car batteries typically have a current ranging between 10A to 20A. Here are specific details about car batteries: Working Principle: During charging, electrical energy is converted into chemical energy, and during discharging, chemical energy is converted back into electrical energy. When discharging, the metal lead acts as the negative electrode, undergoing oxidation to form lead sulfate; lead dioxide serves as the positive electrode, undergoing reduction to also form lead sulfate. Battery Maintenance: Avoid leaving the car parked in open parking lots for extended periods. If long-term parking is necessary, remove and take the battery to prevent freezing damage. Car batteries require regular charging as they gradually self-discharge when unused, leading to eventual failure. Therefore, start the car periodically to recharge the battery.

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What Causes a Car's Air Conditioner to Blow Cold Air Instead of Heating?

How Many Attempts Are Allowed for the Driving License Subject 1 Exam?

Where is the QR code for motor vehicles?

How to Turn On the Rear Speakers in a Car?

What is the function of the valve spring?

Where to Place the Vehicle Annual Inspection Sticker?

What is the current of a car battery?

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