一级目录就(jiù )是学(xué )科大(dà )类,二级目录(lù )就是大类中(zhōng )分(fèn )成的几个(gè )小门(mén )类比如说,法学就是一级目录,环(huán )境与资源保(bǎo )护法学(xué )就是在(zài )法学这个大类下(xià )面所(suǒ )细(xì )分的二级目(mù )录再(zài )比(bǐ )如(rú )艺(yì )术(shù )学(xué )是(shì )一(yī )个大类,你(nǐ )所学(xué )的专业(yè )美术学就是在(zài )艺术学大类下面(miàn )
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