Is the extension line of a line drawn with a solid line or a dotted line

Is the extension line of a line drawn with a solid line or a dotted line

Dotted line, because the line segment has a fixed starting point and length. If the extension line is a solid line, then its definition will be changed, and the length will be changed;
Straight lines can be drawn directly, because straight lines are infinite;
A solid line of rays

What do the yellow solid lines and dashed lines in the middle of the road and the white virtual and solid lines mean

To put it simply: the yellow line is used to draw the back and forth lanes
The yellow dotted line is when there is no car on the opposite side
White solid line is used to divide lanes in the same direction. Solid line means driving in the same direction
The white dotted line is the lane with the same direction as the dotted line, which can be crossed to another lane in the same direction

On traffic roads, there are white double solid lines, yellow single solid lines, white dotted lines, yellow dotted lines, etc,

The center line of the lane is used to separate the opposite traffic flow. The dotted line indicates that under the principle of ensuring safety, the vehicle can cross the line when overtaking and turning left. The white or yellow dotted center single solid line means that the vehicle line is not allowed to cross the line to overtake or drive under the pressure

What does the yellow solid line and yellow dotted line represent in the middle of the road

The yellow line is the dividing line for distinguishing the forward and reverse directions, and the white line is the dividing line for distinguishing driving in the same direction. The solid line can not be borrowed, and the dotted line can be borrowed when ensuring safety. For a parallel virtual and a real line, the dotted line can be driven to one side of the solid line, but can not return

Do the two yellow dashed lines in the center of the road allow the vehicles on both sides to turn around? If one side is a dotted line and the other side is a solid line, is it possible to Allow vehicles on the other side of the dotted line to turn around

Yellow line is used to distinguish the lanes in different directions. It is generally drawn in the middle of the road, like an isolation belt, dividing the road into two directions: 1. No matter single yellow line or double yellow line, as long as it is a solid line, it is forbidden to cross, such as overtaking, turning, turning, etc

What do you mean by the yellow solid line and the yellow dotted line on the road

The virtual and real line in the center indicates that vehicles are not allowed to overtake or turn left on one side of the solid line, while vehicles are allowed to overtake or turn left on the dotted side, and white or yellow virtual and solid lines are allowed

Fill in the "O" of the figure 1-9 so that the sum of the four numbers on each side is equal to 17

It can be concluded from the meaning of the title
The figure after filling in the number is shown in the figure below:
Three sides: 1 + 5 + 9 + 2 = 2 + 4 + 8 + 3 = 1 + 6 + 7 + 3 = 17

There are four different natural numbers. Their sum is 14. If you put them in the four brackets on the right, the sum of the calculated results is still 14. You can

（3）—（1）=（2）
（1）×（2）=（2）
（2）×（3）=（6）
（8）－（4）=（4）

Fill the nine numbers 1-9 into the circles that make up the triangle so that the sum of the four numbers on each side is equal to 20 There are four empty spaces on each side of the triangle graph, and there are nine empty spaces in the middle

In the triangle ABC, AB side: 6,1,8,5; BC side: 5,2,9,4; CA side: 4,7,3,6
Vertex A is 6, B is 5, and C is 4

Fill the nine numbers 1-9 into the circles that make up the triangle so that the sum of the four numbers on each side is equal to 18

Let the number of three vertices be a, B, C, then a + B + C + 1 + 2 + 3 +... + 9 = 18 * 3
So a + B + C = 9, so a, B, C can only be 1,2,6 or 1,3,5 or 2,3,4
If a, B, C are 2,3,4, then any one of 1 plus any two numbers in 2,3,4 and the remaining 5 numbers is less than 18, and then it is omitted
If a, B, C are 1,2,6, then only 7,8 can be filled in on the 1,2 side, and the numbers on the other two sides cannot be filled in, and they are omitted
If a, B, C are 1,3,5, then only 6,8 can be filled in at 1,3, and the numbers on the other two sides cannot be filled in
So there is no solution to the problem