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邮政部门为纪念重大事件、重要活动或人物而专门发行的邮票。是邮票票种之一,图案多以与事件、活动或人物有关的内容为题材,并有特定的纪念文字或徽志及年代,发行数量有一定限制,出售时间较短,一般不再重印。
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fundamentals of aerothermodynamics
Fundamentals of Ecology
Fundamentals of Rock Mechanics
fundamentals of welding
fundamental solution
fundamental solution matrix
fundamental solution method
fundamental space
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fundamental straight line
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fundamental subjects of rehabilitation
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