p.o. 详细解释
p.o.
abbr. 邮政汇票（=Postal Order）
abbr. 订货单（=purchase order）
英英释义
名词 p.o.:
a noncommissioned officer in the navy with a rank comparable to sergeant in the army
同义词：petty officer, PO
a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
同义词：polonium, Po, atomic number 84
a European river; flows into the Adriatic Sea
an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States
同义词：United States Post Office, US Post Office, Post Office, PO
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