819.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 ( )

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

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

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

答案解析

正确答案：A

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