你是真不知？那時中國最現代化的城市大連，沈陽哈爾濱和長春。北京和上海的城市地下排水係統很少，煤氣化程度極低。。。

來源: 老生常談12 於 2014-08-11 19:51:23 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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