《明史·志·卷四十七》
初次选任以及考核决定升降的，双月大选，其次序定在单月。
听选及考定升降者，双月大选，其序定于单月。
Those being selected for the first time and those selected for demotion or promotion, will be selected in the grand selection every two months, and the order will be set in odd months.