Cracks have appeared on the bogie frame of Shanghai metro line 1 following its operation.

 
  • 摘要上海地鐵1號線(xiàn)動(dòng)車(chē)在使用幾年后其轉向架構架齒輪箱吊座就開(kāi)始產(chǎn)生裂紋。
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