题目内容

Aside from movable parts, ________ (电气继电器) are also used.

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However, with________(计算机交通管制), traffc ﬂows much faster.

By reducing the number of_________(交通拥堵), it reduces the pollution caused by cars.

The computer system not only controls the three thousand traffc lights in London, but it also ﬂashes messages on___________ (电子告示牌) along the roads.

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