But there are few theories and methods for the analysis of the transient characteristics of DC line fault.

然而，目前对直流线路故障暂态特性仍缺乏系统、深入的理论研究。

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The circuits of dc-side ripple reduction are based on direct reinjection of the ripple in series with the dc line.

直流侧纹波消除电路是基于直流线路中纹波的直接再注入原理而设计。

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The LDC filter is introduced into a rc welding inverter power source and the voltage ripple of the DC line is decreased.

在弧焊逆变电源中采用LD C滤波电路，可以降低直流线上的电压纹波。

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Renting, particularly along the red line in northwest DC, is expensive.

BBC: Living in: Washington DC

Then perhaps the "neon media flow that carves a delicate energy line from the DC input all the way through to the touchpad" will be enough to sell you on it.

ENGADGET: Acer reveals Gemstone, TravelMate ProFile laptop designs

In the US, Amtrak set a new record as passengers across its national network grew 3.7% from October 2011 to March 2012, with more than 30 million people travelling. the Northeast Corridor line between Washington DC and Boston, which is popular among business travellers, saw an 8% rise in that same period in passenger numbers for the same period.

BBC: Corporate rail travel on the rise