参考文献是为撰写或编辑论文和著作而引用的有关文献信息资源 m是专著 j是期刊 c是会议论文 d是学位论文 p是专利 s是标准 db是数据库 ol是指联机网络 db/ol是联机网上数据库. 管道标注dn、de、、φ、d、d区别： dn是指管道的 公称直径，注意：这既不是外径也不是内径，是外径与内径的 平均值，称平均内径。如：dn200~φ219×6 d一般指管道内径。 d 混凝土.
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