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邮政
由国家管理或直接经营寄递各类邮件(信件或物品等)的通信服务行业,具有通政、通商、通民的特点。是社会、经济、文化、教育活动和人们联系交往的通信基础设施。
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diameter of a conic
diameter of a connected graph
diameter of a domain
diameter of a graph
diameter of a set of points
diameter of a sphere
diametral
diametral pitch
diametric
diametrical
diametrically opposite point
diametric chord
diametric conic
diametric curve
diametric hyperplane
diametric line
diametric plane
diametric surface
DIAMEX流程
diamicron
diamide extraction process
diamine
diaminocaproic acid
diamond
diamond and diamond-like carbon
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