This system circuit is simple, of high reliability and can be easily upgraded.

实验表明，系统电路简单、可靠性高，可升级性强。

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The paper elaborates with emphasis principle and function of controller test system circuit.

论文详细分析了控制器测试系统各部分电路的原理和功能。

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The DSP control system circuit and the hardware circuit of limited finite corner direct current motor without brush has been finished.

完成了DSP控制电路、有限转角无刷直流力矩电机驱动电路的硬件设计；

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The city has more than 10,000 closed circuit security cameras, including in the transportation system.

VOA: standard.2010.04.01

The Global Positioning System circuit, several power converters and a set of devices that route commands to various pieces of equipment were switched off.

BBC: Cooling system fault hits International Space Station

Voice traffic on cellular networks currently is routed with what is known as a circuit-switched system.

WSJ: U.S. Wireless Carriers Move to New Technology��for Voice

The SEC has already proposed a number of changes designed to address their growing influence, including extra restrictions on broker-dealers that provide direct market access to high frequency traders, a trader tracking system for large traders, circuit breakers that would slow trading in individual stocks if they fall more than 10%, and new rules for off-exchange trading venues.

FORBES: SEC Wants Real Time Trading Data