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請(qǐng)問(wèn)弓箭的弓弦一般是什么材料?一般的弓需要多大的力量才能拉開(kāi)? |
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Archiver|手機(jī)版|小黑屋|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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