7199| 27
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怎么分析它的力學?如圖,請教 |
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點評
因為打進去的時候會受到錐面的擠壓
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小黑屋|手機版|Archiver|機械社區 ( 京ICP備10217105號-1,京ICP證050210號,浙公網安備33038202004372號 )
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