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此外，作为改型件，还可提供各种指示灯，避雷器，相位保护器和安全火花继电器。
In addition, various pilot lights, lightning arrestors, phase protectors and intrinsically safe relays are available as modifications.
本文采用模糊控制算法对四相位三车道单交叉口的交通灯进行控制。
This paper uses the fuzzy control algorithm carries on the control to four phases three traffic lanes single road intersections traffic light.
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