手册应易于修订，它们可以是活页形式，带有耐用的多环形封面或者永久性装订

AHandbooks shall be readily revisable. They may be in loose-leaf form, with durable, multi-ring cover, or permanently bound；

BHandbooks shall be easily revisable. They may be in loose-leaf form, with durable, multi-ring cover, or permanently bound；

CHandbooks shall be readily changeable. They may be in loose-leaf form, with durable, multi-ring cover, or temporary bound；