由经验判断，确定两次采样允许的最大偏差A，每次检测新值时判断：如果本次的值与上次的值 <=A,则有效，如果大于A,则本次值无效，放弃，用上次的值，代替。 -Judging by experience, to determine the maximum permissible deviation of two samples A, each time a new value test to determine: If this value with the previous valu