What is Maple Leaf Card

1. Maple Leaf Card is a common name for the Canadian permanent resident card, which was officially implemented on June 28, 2002.

2. The validity period of the Canadian Maple Leaf Card starts five years from the date of the spontaneous card. However, in some exceptions, if the identity of a permanent resident is ultimately determined by the final judgment due to failure to perform their residence obligations abroad, the applicant can apply for a one -year maple leaf card.

What is a black hole

This is a celestial body that exists in the universe space in the modern general relative nature. The gravity of the black hole is very large, making the escape speed on the field greater than the speed of light. This is a celestial body that cannot get rid of the vision of the incident in the event.

Sports natural department:

According to the physical characteristics of the black hole itself, the amount and charge of the angle motion can be divided into five categories.

1. There is no black hole without charging: It was found in 1916 that its space structure structure was called Swana Black Hole.

2. Do not rotate the black hole: called R -N black hole. From 1916 to 1918, the space structure was discovered with Na Zidun.

3. Rotate without charging black holes: called Kel black hole. Kell discovered the space structure in 1963.

4. Black holes are generally called Kyle-Newman black holes. Newman discovered the space -time structure in 1965.

5. Shuangxing Black Hole: Black Hole and other black holes.

What is an asymptomatic infection of new crown pneumonia?

The symptoms of new crown pneumonia refer to the secretion of patients with patients in the patient's respiratory tract. The respiratory tract can detect the nucleic acid of the new coronary artery virus as positive, such as nasopharynx test bar, an orderly test bar.

Non -symptoms may also be hidden infections, and the symptoms are not obvious. At the same time, asymptomatic infections are contagious, so once you find asymptomatic infections, you must be strictly separated, observed and detected.

Symptoms may also develop into symptoms of infection. Many asymptomatic infections are found among people who have a history of contact with a history of contact. Once you find them, you need to isolate. Now, in addition to confirming cases, the disease reports of the disease and the control department have also increased asymptomatic infections. Because it is also required to beolate non -symptoms, and it is very important for controlling the source of infection.

What is the main building

The main key is the root key.

The book records the software installed on each program and the information related to each program. It can control data information files of hardware, software, user environment and operating system interfaces.

Root key: called HKEY, the handle of a project;

Project: other folders and one or more values;

Sub -information: The child project that appears under the parents;

Value: Use the order of the name and value. Each item can include the value of any amount. The values ​​include three parts: name, data type and data.

What is the minimum turn radius

1. The minimum turning radius refers to turning the limit position when turning the wheel. When the car turns at the minimum and stable speed, the center of the external turbine is rolled through the rail radius and rolled on the support plane.

2. It largely represents the ability to pass the car through a narrow bending area or bypass non -crowded obstacles. The smaller the turning radius, the better the motor performance of the car.