In order to make the road safe and orderly, many traffic signs were erected along the road,
The average speed of a period of time or a displacement speed, the instantaneous speed of said at a certain time or a location speed. Distance representation of motion trajectory length, displacement is equal to the initial position to the end position of the distance.
To Zhucheng, there are 170km, 170km is the length of the trajectory, is the distance. So B correct, A, C, and D errors
The maximum speed at which a trip is allowed represents the speed at one point, which is instantaneous speed, so 100 km/h is the instantaneous velocity;
