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邮政史
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邮政史
Encyclopedia
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postal history
邮政史
邮政发展的历史。邮政是依赖实物传输网进行书面通信和快速送达小件物品的系统。“邮”指通信方式和组织,“政”指由国家政权进行统治。数千年来,绝大多数邮政系统为政府运行。至今,邮政大力发展,已经具有通政通民通商的特征,也是国民经济运行不可或缺的行业。
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quenching agent
quenching and tempering
quenching approximation
quenching boiler
quenching defect
quenching effect
quenching effect of atomic fluorescence
quenching intensity
quenching machine
quenching of luminescence
Quenching Partitioning Heat Treatment
quenching tank
quenching technique
quenching time
quench protection
quench system for spinning
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Quentin Tarantino
quepen
Queqiao Relay Satellite
quercetin
Quercus Montane Sclerophyllous Evergreen Broadleaf Forest Alliance Group
Quercus River Valley Sclerophyllous Evergreen Broadleaf Forest Alliance Group
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quermass
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