公路都是中间高两侧低,可�现马路上的井盖都是在路中间,一下雨路两侧全是积水,那这竖井是干啥用的? 知乎 Template




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tomski公路都是中间高两侧低,可�现马路上的井盖都是在路中间,一下雨路两侧全是积水,那这竖井是干啥用的? 知乎 coloring