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Seepage velocity smoothly change from a steady value to a new steady value, the ratio of the new steady value over the original steady value might increase hundreds of thousand times or even more, but it is always finite.（3）Water-inrush goes with the failure of rock strata, but seepage velocity can not increase unendingly, so seepage flow cant be unstable.
研究表明：由于非Darcy流β因子恒为正值，渗流系统总是稳定的；当渗透特性随时间变化时，渗流速度从一稳定值平滑地过渡到一新的稳定值，新的稳定值与原稳定值之比可以增大到几万至几百万倍，但是总是有限的；突水是岩层结构破裂引起的渗流速度快速或急剧变化，但渗流速度不可能无止境地增大，即渗流不可能失稳。
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The results indicated that the detected MDV1 in feather tip was the most abundant in all of samples (10^-10^8 copies per million cells). The FQ-PCR had a higher positive rate (100%) compared with AGP and regular PCR methods, and its sensitivity was 10-100 times than that of regular PCR, and the lower detection limit of the MDV1 assay was 2.78 copies.
结果表明，不论实验攻毒鸡还是自然发病鸡，羽髓中病毒富含量均高于其它组织，每百万宿主细胞内病毒含量为10^7~10^8拷贝；FQ-PCR检侧MD发病鸡只的阳性率高于AGP，达100%；该方法的灵敏度比常规PCR检侧高10~100倍，在单位细胞内可灵敏地检测到2.78个拷贝的病毒。
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millionfold：百万倍地
millionfold 百万倍的 | millionfold 百万倍地 | millionmillionsmega 百万