What is the diameter of a baseball?

Baseball is a collective and antagonistic ball game characterized by baseball, which is known as "the combination of competition and wisdom" and is a collective game that integrates wisdom and courage, fun and cooperation.

It combines static and dynamic, and the division of labor is clear. Players not only emphasize personal wisdom and talent, but also pay more attention to strategy, tactics and mutual cooperation. Members have a clear division of labor and clear responsibilities, and must actively cooperate and serve each other. If necessary, individuals should be willing to sacrifice themselves for the overall situation.

Under the blue sky and green grass, put down the burden of work and give yourself to your team. The teammates around you are your usual colleagues. In an interesting baseball game, you can better understand the importance of trust, tolerance and encouragement.

In baseball, everyone has the opportunity to become a master. He should have his own position and your judgment on the overall situation. In the fierce competitive confrontation, devote yourself wholeheartedly, when you run to your heart's content, when you motivate your players, when you discuss tactics with everyone.

In fact, you are creating your own miracle.

Extended data:

Baseball can be divided into soft ball and hard soft ball. Soft ball is made of rubber, hollow, elastic and light in weight. Retail price is 20-50 yuan, the size is divided into ABC third class, and it is generally written on each ball. Class A is a standard size and can be used by adults.

There are two kinds of hard baseball: horse skin and cowhide, but now both professional baseball and amateur baseball are cowhide. This kind of hard ball is made of cork, rubber or similar materials, wrapped with thread, and the surface is sewn firmly with two pieces of white horse skin (cowhide).

The weight is141.8g to148.8g. When the marble slab falls from a height of about 4m, its peripheral area is 22.9cm to 23.5cm "and its elasticity is about1.4m.. The general retail price ranges from 15-40 yuan.

Baidu encyclopedia-baseball