许可证件管理系指一定时期内(一般是1年)，国家对部分商品的进口制定关税配额税率并规定该商品进口数量总额，在限额内，经国家批准后允许按照关税配额税率征税进口，如超出限额则按照配额外税率征税进口。

Public relations practice is the deliberate , planned and sustained effort to establish and maintain mutual understanding between an organization and its public.

A．complete

B．related

C．intentional

D．active