thin-wall-centrifugal-concrete-steel-tube-tower

 
['θ?nw'??lsentr?fj'?ɡlk'?nkri?tst'i?ltj'u?bt'a??r]     ['θ?nw'??lsentr?fj'?ɡlk'?nkri?tst'i?ltj'u?bt'a??r]    
  • 薄壁離心砼鋼管塔

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