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 mark (class mid-point)
class mid-point (class mark)
class-A and class-B communicable diseases
Class-A and class-B infectious disease
Class-A and Class-B infectious diseases
International Maritime Organization class {= IMO class}