学科分类导航
net resouces subject guide
学科分类与代码
classification and code of disciplines
景观生态分类
landscape eco-classification
Landscape ecological classification
Classification of landscape ecology
景观分类系统
landscape classification system
精神疾病诊断与分类
Diagnostic and Statistical Manual
晶体之光电分类
photoelectric classification of crystal
晶体管自动分类机
automatic transistor classifier