The following statement is that between two points, the shortest straight line AB and the straight l

1.Between two points, the line segment is the shortest; The straight line number can be reversed because it has neither a beginning nor an end; Line segment AB and line segment BA are the same line segment; Ray OA is not the same ray as ray AO, the former has an endpoint of O, and the latter has A.

2.There are 10 rays in total; There are 10 line segments.

Three of a kind. 4.All real numbers from -1 to 0, including 1 and 0

1.False: The shortest line segment between two points. Right. There is no directionality to the line segment and the wrong ray is directional.

2 10 rays (each letter is a short dot, one to the left and right) 10 line segments (one for every two letters).

(ab ac cb).

to -1 on all numbers.

1.No, because a straight line that can be extended indefinitely is certainly not the shortest.

Yes, the straight line thought it could be extended indefinitely!!

Yes, the line segment is not directional.

No, the rays are directional.

2.Either way, as long as one end is dotted and the other end is not there (half a grid and several letters) 3Infinite, there are countless points in the line segment.

Any number within includes 0 and -1

Good luck with your studies!

The shortest line segment of all lines between two points; The length of the line segment AB means that the tremor is the distance between points A and B

Therefore, the answer is: the line segment is only chaotic, and the distance

Analysis of key elimination: according to the nature of the line segment: the line segment between the two early bridge marks is the shortest, and the solution can be done

The line segment between the two points is the shortest, so choose: b land and land.

Comments: This question tests the mastery of the nature of line segments, and skillfully remembering the nature of line segments is the key to solving this problem

The first three statements are less rigorous, 1The straight-line distance between two points is the shortest, 2The length of the line segment connecting two points is equal to the distance between the two points, the three points are on the same straight line, if ab=bc, then b is the ac midpoint.

1.Error: The shortest straight line segment between two points is 2Error: The length of the line segment connecting two points is called the distance between the two points.

3.Error: e.g. angular abc 4That's right.

4.An angular bisector is a ray.

a. It should be the shortest line segment between two points, so this option is wrong;

b. It should be a point outside the straight line, and only one straight line is parallel to the known straight line, so this option is wrong;

c. It should be in the same plane, and there is only one straight line perpendicular to the known straight line, so this option is wrong;

d. There is only one straight line perpendicular to the known straight line at a point in the plane, so this option is correct, so D is selected

A, in all the lines connecting the two points, the line segment is the shortest, so A is wrong, B, the line segment AB is the distance between the point A and the point B, the distance and the line segment are not the same concept, so B is wrong, C, the line has no endpoint, and there is no midpoint, so C is wrong, D, reverse extension line segment AB, get ray BA, so D is correct, so D is selected

d.The length of the line segment ab is the distance between two points, correct.

a.The length of the straight line ab is the distance between two points, and the straight line is infinitely long, so it is wrong bThe line segment ab is the distance between two points, and the line segment is a line, not a distance, so the length of the line between the two points is wrong, and the line can be straight or curved, so it is wrong.

d If the reason is a b must be wrong, if c is the connection is not necessarily straight.

Of all the lines between two points, the line segment is the shortest, which is correct;

In the same plane, there is only one and only one straight line perpendicular to the known straight line, which is wrong;

Two straight lines parallel to the same straight line are parallel to each other, which is true;

The length of the perpendicular segment from the point outside the line to the line is called the distance from the point to the line