有两组知识库元素：主访问控制（ Primary Access Controlled，PA C）与次要访问控制 （Secondary Access Controlled，S A C）。
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...; 专家 > 内容 文献名称：聚合氯化铝混凝机理及混凝条件对余铝的影响 前言：聚合氯化铝(Poly alum inium chloride,PA C)俗称羟基氯化铝、碱式氯化铝、聚硫氯化铝、多聚羟基络合物,它是一种新型的高效无机高分子净水剂。
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以上来源于: WordNet
N-COUNT A PAC is an organization that campaigns for particular political policies, and that gives money to political parties or candidates who support those policies. PAC is an abbreviation for . 政治行动委员会 [美国英语]
Something like $2 million of PAC money has flowed into his campaigns for the last 17 years.
在过去17年间，差不多200万美元的政治行动委员会资金业已注入到他的竞选活动之中。
Marisa C. Weiss, M.D., breast radiation oncologist, Lankenau Hospital, Thomas Jefferson University Health System, Philadelphia, pa.
Marisa C . Weiss医学博士乳腺癌放射肿瘤学家，lankenau医院，托马斯·杰弗逊大学卫生系统，费城。
The main C and D power amplifier PA example on the analysis of resonant power amplifier circuit as well as a practical circuit Comparative Study.
主要以丙类功放和丁类功放为例分析介绍了谐振功率放大器的电路组成并对实用电路进行了比较研究。
The death rates of D-TGA and PA/IVS in the group F were much higher than those in the group C.
组患儿中大动脉转位和室间隔完整的肺动脉闭锁手术死亡率均明显高于C组。
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