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单词
PPB
释义
PPB
abbr.
planning-programming-budgeting (system) 计划—设计(程序)—预算制(或法)(一种商业、政府、研究机构的计划方法) [亦作 PPBS]
ppb, ppb.
abbr.
parts per billion [美国英语]十亿分率,十亿分之…
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更新时间:2025/8/21 1:36:49