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在一些行人不频繁出现的小路口,人行灯必须有人按才会亮,没有人行的话,汽车通行的绿灯时间比较短;有人行的话,绿灯时间稍微长一些,因为行人走得慢。大路口,绿灯时间足够行人通行,一般人行灯自动亮
zoomin
(毛豆儿)
据我不完全观察
(#11117513@0)
Last Updated: 2017-10-17
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昨天晚上去gym的路上,娃问我一个问题,我回答的不好,上来征求好的答案
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