Qq space, what does the second praise interval mean?

Interval time: generally refers to the time interval.

Definition:

Call a time as short as almost zero an instant, and an instant is time; It can be regarded as a line segment, which must have a beginning and an end, that is to say, the time interval is the part between two time points, usually called the length of time.

Division method:

The moment is: the first few seconds; After a few seconds. At the end of the first few seconds; At the beginning of the last few seconds.

Belong to the time interval: within a few seconds; Within a few seconds; A few seconds ago; In the next few seconds; A few seconds.

Time interval refers to a period of time between two different moments. Kinematics of point L uses vector diameter method, rectangular coordinate method and natural method to study the motion of point to a reference system, including the motion equation, trajectory, velocity and acceleration of point.

Time intervals usually correspond to distances, displacements and other process quantities.