2. If the players of both sides can't reach an agreement on the game ball, they can decide a game ball at will;
3. Presided over the lottery to decide the serve, receive and position.
4. When an athlete cannot abide by some legal service rules due to physical disability, the referee shall make a ruling.
5. Control the orientation, serve order and receive order, and correct the above mistakes;
6. Decide to score or serve again in each round;
7. Score according to the prescribed procedures;
8. Execute the rotation serve method at an appropriate time;
9. Keep the continuity of the game;
10. Take action against those who violate the guiding behavior regulations.