如某企业的市场占有率为30%,其三个最大的竞争者市场占有率分别为20%、12%、8%,则该企业的相对市场占有率为( )。If the market share of an enterprise is 30%, the market share of its three largest competitors is 20%, 12% and 8% respectively. The rel
【解析题】____ is based on solar calendar.
关于文摘数据库和全文数据库,下面哪种说法是正确的?