MySQL add adds multiple new fields and specifies the field location

ALTER TABLE `t` 
add `accomplish_period_second` INT(11)  UNSIGNED  NOT NULL  DEFAULT '0'  COMMENT ' Expired task cooling off period （ second ）, How long the task countdown ends? This task cannot be completed repeatedly ' after `id`,
add `receive_second` INT(11)  UNSIGNED  NOT NULL  DEFAULT '0'  COMMENT ' Validity period of task collection ' after `id`,
add `expiry_type` tinyint(4) unsigned NOT NULL DEFAULT '0' COMMENT ' Task validity type  0= Persistent  1= The period of validity ' after `id`
;