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仿印邮票
邮政部门为集邮展览、集邮活动、集邮品制作等仿照已经停用的早期珍罕邮票,重新制版印制的“邮票”。由于明文宣告是仿印,在其票幅、纸质、刷色、齿孔、暗记等细节上与真邮票有所区别,有的在仿印邮票票背上印有“仿制品”字样。
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sound discrimination training
sound dispersion
sound dissipation factor
sound distortion
sound distribution
sound drag
sound duct
sound editor
sound effect
sound effects recording process workflow
sound-emitting fireball
sound energy density
sound energy density, acoustic energy density
sound energy flux density
sound entrainment
sound equations
sounder
sounder key
sound exposure level
sound fade out and fade in
sound field
sound field, acoustic field
sound field quantity
sound flash back
sound flash forward
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