自由，做为原则，在人类能够于自由和平等的讨论之下取得进步之前，对任何情形都不适用。
Liberty, as a principle, has no application to any state of things anterior to the time when mankind have become capable of being improved by free and equal discussion.
指出分析电路的过渡过程时换路定律不是在任何情况下都适用的，详细分析了该定律不适用的各种情形。
This paper indicates that the law of switching is not applicable in any cases when analyzing the transient state of circuit.
PMCD和DGD均采用针对不同钻井目的的闭环系统，通常用于因技术或经济原因而导致常规方法不适用时的情形。
CBHP, PMCD and DGD all use the closed-loop system specifically for drilling purposes and usually only when conventional methods are not applicable for technical or economic reasons.
PMCD和DGD均采用针对不同钻井目的的闭环系统，通常用于因技术或经济原因而导致常规方法不适用时的情形。
CBHP, PMCD and DGD all use the closed-loop system specifically for drilling purposes and usually only when conventional methods are not applicable for technical or economic reasons.
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