永久型虚拟电路(Permanent Virtual Ci r c u i t，P V C )是一种一直都保持的逻辑通信信道。这种连接即使是数据传输结束了都会保持。
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同义词： polyvinyl chloride
以上来源于: WordNet
N-UNCOUNT PVC is a plastic material that is used for many purposes, for example, to make clothing or shoes or to cover chairs. PVC is an abbreviation for "polyvinyl chloride." 聚氯乙烯
The method of measuring c, s, p, Mn, Si, Cr, Ni, Mo, V, W, ti, Nb, Al element content by DV-4 photoelectric spectroscope on one condition is introduced.
介绍了应用DV - 4光电光谱仪，仅用一种测定条件，测定高合金钢中碳、硫、磷、锰、硅、铬、镍、钼、钒、钨、钛、铌、铝元素的含量的方法。
Objective: To sequence V-region and P-region gene of surface protein of serotype c Streptococcus mutans clinical isolates with different adherent abilities.
目的：对不同粘附力变形链球菌临床分离株表面蛋白V区、P区编码基因进行序列测定。
Results The SDNN and the frequency of P. V. C. existed obvious correlatively.
结果SDNN值和室早发生频次存在明显的昼夜节奏变化和相关性。
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