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想設(shè)計(jì)一根長(zhǎng)度30cm直徑4mm一端在90度范圍內(nèi)自由彎曲的桿子? |
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小黑屋|手機(jī)版|Archiver|機(jī)械社區(qū) ( 京ICP備10217105號(hào)-1,京ICP證050210號(hào),浙公網(wǎng)安備33038202004372號(hào) )
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