A—securities business K—stock companyB—stock exchange corporation L—securitiesC—quotation M—common stockD—share N—preference stockE—-shareholder O—income gainF—dividend P—issueG—cash dividend Q—par valueH—stock investment R—opening priceI—investment trust S—closing price J—stock-jobberExamples：(I)投资信托 (L)有价证券

填空题 ( )证券公司 ( )普通股

填空题 ( )股票持有人 ( )股利收入

填空题 ( )股票投资 ( )证券交易所

填空题 ( )优先股 ( )股票经纪人

填空题 ( )开盘 ( )投资信托