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中國需要進(jìn)口高精度的螺帽、彈簧嗎? |
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點(diǎn)評
高鐵螺栓對防松要求非常高。
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小黑屋|手機(jī)版|Archiver|機(jī)械社區(qū) ( 京ICP備10217105號-1,京ICP證050210號,浙公網(wǎng)安備33038202004372號 )
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