Traffic lights at the crossroads of the changes requested (1) above the junction of the green light, following the red light intersection at the same time light about 30 seconds. (2) above the junction of the yellow light flashes several times, at the same time continue to light following a red light intersection. (3) above the junction of the red light, green light junction at the same time the following light about 30 seconds. (4) above the junction of the red light continues to shine, while below the yellow light flashes a number of junctions. (5) to (1) repeat.

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实验二.doc

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