飞龙在天
发表于 2012-7-27 12:13
网曝世界各国下水道实景 看后我表示震惊了
http://bbsfile.ifeng.com/bbsfile/cmsupload/albums/2012-07/66296451_f3ccdd27d2000e3f9255a7e3e2c48800.jpg
飞龙在天
发表于 2012-7-27 12:14
http://bbsfile.ifeng.com/bbsfile/cmsupload/albums/2012-07/74831425_156005c5baf40ff51a327f1c34f2975b.jpg自1892年，游客就开始坐观光车参观巴黎下水道
飞龙在天
发表于 2012-7-27 12:16
http://bbsfile.ifeng.com/bbsfile/cmsupload/albums/2012-07/36025507_799bad5a3b514f096e69bbc4a7896cd9.jpg巴黎清理下水道的机器设备
飞龙在天
发表于 2012-7-27 12:17
http://bbsfile.ifeng.com/bbsfile/cmsupload/albums/2012-07/99970671_d0096ec6c83575373e3a21d129ff8fef.jpg用来清理巴黎下水道的球形推水器
飞龙在天
发表于 2012-7-27 12:17
http://bbsfile.ifeng.com/bbsfile/cmsupload/albums/2012-07/15601949_032b2cc936860b03048302d991c3498f.jpg
飞龙在天
发表于 2012-7-27 12:17
http://bbsfile.ifeng.com/bbsfile/cmsupload/albums/2012-07/93035107_18e2999891374a475d0687ca9f989d83.jpg
飞龙在天
发表于 2012-7-27 12:18
http://bbsfile.ifeng.com/bbsfile/cmsupload/albums/2012-07/24303675_fe5df232cafa4c4e0f1a0294418e5660.jpg
飞龙在天
发表于 2012-7-27 12:18
洼地——渗渠系统”示意图
飞龙在天
发表于 2012-7-27 12:18
http://bbsfile.ifeng.com/bbsfile/cmsupload/albums/2012-07/11445356_8cda81fc7ad906927144235dda5fdf15.jpg
飞龙在天
发表于 2012-7-27 12:19
http://bbsfile.ifeng.com/bbsfile/cmsupload/albums/2012-07/96452018_30e62fddc14c05988b44e7c02788e187.jpg