A—acceptance letters J—reference lettersB—adjustment letters K—sales lettersC—application letters L—news releasesD—collection letters M—annual reportsE—complaint letters N—feasibility reportsF—credit letters O—investigative reportsG—inquiry letters P—progress reportsH—memorandums Q—trouble reportsI—order letters R—trip reportsExample：(D)催款函 (B)投诉回复函

填空题 ( )投诉函 ( )咨询信／询价函

填空题 ( )推销信 ( )推荐函

填空题 ( )新闻发布 ( )申请函

填空题 ( )进度报告 ( )年度报告

填空题 ( )调查报告 ( )事故报告