Hardly anyone remembers it these days , but there was a time when a version of at t unix ran on apple s quadra machines 现在几乎没人记得这些了，但曾经有一段时间，有一个at & t unix版本运行于apple的quadra计算机上。
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Abstract : this article reports a study on the synthesis and propertiesis of thioethers bi - equivalent magenta couplers . experiments carried on color negative film and color paper showed that these bi - equivalent couplers perform higher photographic activity and higher stability compared with conventional quadra - equivalent magenta couplers and are also different from dir couplers 文摘:本文叙述硫醚类二当量品红成色剂的合成和性能研究，经彩色胶卷和彩色相纸应用试验，与四当量成色剂比较，有着更高照相活性与稳定性，并说明了与dir品成色剂的区别。
