DDC中每个学科都会给予特定范围的数位来表示，它的十个大类（main classes）分别是：
基于36个网页-相关网页
teaching the main classes 主体班教学
main part classes 主体班
main chain classes 主类
There are two main classes, Type I and Type II.
超新星有两类：I型和II型。
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Figure 11 shows the main classes and methods for profiling.
图11显示了用于概要分析的主要类和方法。
The main classes are RootDocs that contain the parse tree.
主要的类是包含解析树的 RootDoc 。
All the patients had failed with the two main classes of medicines used in breast cancer and were extremely sick.
FORBES: Pfizer Takes Cancer By Storm
There was also water damage throughout the building, causing the cancellation of classes in the Main Building and an adjoining building on Friday and Saturday, the school said.
WSJ: Fire Damages Pratt Building
Its main concern is about teaching assistant taking classes.
BBC: NEWS | UK | Education | Heads quit school workload deal
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