CR class rate

class attendance rate

class recognition rate

tax rate and tax class

The first class nutlet rate

first-class class

class Class

Rate rate of blowing out

sediment accumulation rate rate

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

Class I and Class II

class mark (class mid-point)

class mid-point (class mark)

ClassⅠ and ClassⅡ