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

32-bit file allocation table

3D model file

3DS file

3DS model file

8 bit BMP image file

a file

abrasive file

abstract file

access by record file address

access existing permanent file

access file

access routine code file

according file

accounting file

accounts receivable file