case history method; case method; case study method
Case-addition and Case-deletion policy
free case no charge for case
Case study or case history method
1st Class or 2nd Class Control
angle Class Ⅱand skeletal class I malocclusion
between-class and within-class scatter
Class Ⅰ and Class Ⅱ highways
class A and class B filling zone
Class A and class B infectious diseases