我觉得区别不大，只是As per多用于正式文件，尤其是具有法律效力的法律文书中： Pls arrange our shpt as per above-mentioned shipping schedule
1.Quality as per buyer's sample 凭买方样品质量交货 2.Quality as per seller's sample 凭卖方样品质量交货 3.Do not install these machines as per the project documentation 不要按照工程文档安装这些机器 4.See the attached schedule or as per the attached schedule. 参见附件。 我认为二者区别不大，可互换，但according to较常用 参考：爱词霸
答：according 是副词，它和to 放在一起才是介词.这样它们有三个意思:1、据（某人）所述；根据（某事物）。2、依照，依照（某物）；3、视或依（某事物）而定...详情>>
答：I haven't window molding catalogs on hand. catalogs 产品目录 haven't ~ something ~ o...详情>>
问：working hard vs. hard working
答：there are no defferent.详情>>
