1st Class or 2nd Class Control

angle Class Ⅱand skeletal class I malocclusion

Class Ⅰ and Class Ⅱ highways

Class A and class B infectious diseases

Class I and Class II

3D photograph

Aerial Photograph

aerial photograph interpretation， API

aerial photograph remote sensing

aerial photograph scale

annotated photograph

azimuth of photograph

back-reflection photograph

balloon photograph

bedside photograph

chest photograph

coherent radar photograph

color aerial photograph

color composite photograph

Colorful Woven Photograph