裁判员一旦发现运动员应交换方位而未交换时，应立即暂停比赛，并按该场比赛开始时确立的次序，按场上比分运动员应站的正确方位进行纠正，再继续比赛。
 If the players have not changed ends when they should have done so, play shall be interrupted by the umpire as soon as the error is discovered, and shall resume with the players at the ends at which they should be at the score that has been reached, according to the sequence established at the beginning. 
A、正确
B、错误