DC driving system is the main form of automatic control system.

直流调速系统是自动调速控制系统的主要形式。

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In the alteration of the rewinder's controlling system, DC driving is replaced by ac driving, and frequency governors are used to control the ac motors.

在对复卷机控制系统的改造中，我们用交流传动代替直流传动，用变频器对交流电机进行调速控制。

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Based on the fault condition, various causes for shaking of rotating speed of DC driving system for hoist, and specific solutions were proposed in combination with the practical condition.

根据故障现象，分析了提升机直流拖动系统产生转速抖动的各种原因，并结合实际提出了具体的解决办法。

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It took place in a restricted driving area at the University of Maryland, near Washington,DC.

VOA: special.2009.11.03

The decision of the Iraqi prime minister, Nuri al-Maliki, more or less to endorse Mr Obama's timetable for withdrawing American troops from Iraq sent shock waves through Washington, DC, discombobulating the White House and driving the McCain campaign into panic.

ECONOMIST: Lexington

In the US, trains are largely impractical as an alternative to flying or driving, with a few notable exceptions like the Northeast corridor (NYC, DC, Boston and Philadelphia).

FORBES: Don't Fly - Why Trains Are the Best Way to Travel Overseas