When the free electrons in a conductor move in one direction only. The current thus established is called a direct current, which is often abbreviated to DC.
当导体的自由电子只以一个方向运动时，这样产生的电流叫做直流电，常缩写为。
DC has many wonderful, free museums and beautiful monuments to remind us of history.
华盛顿有令人惊叹的、免费的博物馆和能让我们回忆起历史的很漂亮的纪念碑。
The yuan is still not a free-floating currency, and only seems to appreciate when tempers in Washington, DC, reach boiling point.
人民币还不是完全的浮动汇率，只有当华盛顿怒发冲冠时，才升值那么一点。
The hydrogen molecule is decomposed into hydrogen proton and set free electron under acting on catalyst. And free electron is formed DC in external circuit to output electric energy.
氢燃料电池在催化剂作用下，氢分子解离为氢质子并释放出电子，电子在外电路形成直流电输出电能。
The practice proves that this system can be effectively increase the level of free maintenance and operation reliability of DC adjusting speed control system.
实践证明，该系统能有效提高直流调速传动控制系统的运行可靠性及免维护水平。
Their electronically commutated brushless DC motor provides virtually maintenance-free operation over time by eliminating brush maintenance and associated brush motor failure.
其电子换向直流无刷电机通过排除刷子维护和关联电机的出错，在操作过程中提供免维护操作。
DC Variable AC, quasi-sine wave. Automatic protection, safe and reliable. Small size, light weight and high efficiency. Pollution-free, maintenance-free, easy to use.
直流变交流，准正弦波。全自动保护，安全可靠。体积小，重量轻，效率高。无污染，免维护，使用方便。
Brushless frequency motor for model DDL5M and Brushless DC motor for DDL5 which in great torque, free maintenance, no powder pollution, quick in speed up and down.
DDL5M采用无刷变频电机；ddl5采用无刷直流电机。无粉尘，免维护，力矩大，升降速度快。
Brushless frequency motor for model TGL16M and Brushless DC motor for TGL16 which in great torque, free maintenance, no powder pollution, quick in speed up and down.
TGL16 M采用无碳刷变频电机，TGL16采用无碳刷直流电机，免维护，大力矩，升降速快。
The tubes in which the rays were generated were known as Crookes tubes, which generated free electrons - then a topic of intense study - by applying a (DC) voltage of up to 100 kilovolts across a gap.
这些射线生成管也叫克鲁克斯管，通过在管道周围的裂缝处施加高达十万伏电压的方式，可以在其内部产生自由电子。
To obtain high average current electron beams for high average power Free Electron Laser (FEL), a DC-SC photocathode injector is designed.
为获得用于高平均功率自由电子激光（FEL）的高平均流强电子束，设计了一种新型的DC- SC光阴极注入器，并对其进行了优化设计和束流动力学研究。
Brushless frequency motor for model TDL5MC and brushless DC motor for model TDL5C which in great torque, free maintenance, no powder pollution, quick in speed up and down.
TDL5 MC采用无刷直流变频电机；tdl5c采用无刷直流电机，均免维护，无粉尘，力矩大，升降快。
Extremely strong, brushless DC motor with dust-proof encapsulation and maintenance-free.
强劲的无刷直流电机，防尘封装切免维护。
Extremely strong, brushless DC motor with dust-proof encapsulation and maintenance-free.
强劲的无刷直流电机，防尘封装切免维护。
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