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各種材料,包括材料厚度,,最小彎曲系數(shù)(內(nèi)r),的資料---求助 |
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小黑屋|手機版|Archiver|機械社區(qū) ( 京ICP備10217105號-1,,京ICP證050210號,,浙公網(wǎng)安備33038202004372號 )
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