“函”和“请示”都是使用频次相当高的法定公文文种。国务院2000年8月24日发布、2001年1月1日起施行的《国家行政机关公文处理办法》(以下简称《办法》)规定:“函”“适用于不相隶属机关之间商洽工作,询问和答复问题,请求批准和答复审批事项”; “Letter ” and “invitation ” are the use of a very high frequency of official documents. Measures promulgated by the State Council on August 24, 2000 and implemented on January 1, 2001 stipulate that the “Measures for the Administration of Official Documents of the State Administrative Organs” (hereinafter referred to as the “Measures”) stipulates that “letter” “shall apply between unaffiliated agencies Negotiate work, ask and answer questions, request approval and reply approval matters ”;