Refresher course on proper hand hygiene !

适当的卫生的进修课程！

School of government peking university postgraduate refresher courses .

北京大学政府管理学院研究生课程进修班。

Salesmen have to attend refresher courses frequently .

销售人员必须经常参加专业进修。

Even experienced managers periodi - cally should be given refresher courses in management style and techniques .

甚至给有经验的经理上管理类型和技巧的进修课程。

Refresher class for full-time leaders of national defense mobilization opened .

国防动员专职领导干部进修班开学。