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Exercise4 - 1 3 89 89 89 5 2.5 2.5 31.66 31.66 25 25 130...

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第第第 第第第第第第第第第 第第第第第第 1. 第第第第第第第第第第第第第第第第第第第第第第第第第第 第第第第第第第第第第第第第第 第第第第第第第 第第第第第第 第第第第第第第第第第第第第第第 3 第第第第第第第第第第第第第第第第第第第 第第第 第第 第第第 第第第 第第 第第 第第 第第 第第 第第 第第 第第第第第 89 5 31.66 130 60 4 24 第第第第第 31.66 130 60 4 24 第第第第第 89 2.5 25 108 50 5 16 第第第第第 89 2.5 25 108 50 5 16 第第第第第 第第第第第第第第 165 第第 /3000n 第第第第第第第第 43kg· m/1200n 第第第第第第 i =1.348 i =2.410 第第第第第第 i =7.58 i =4.3 i =2.45 i =1.49 i =1.0 i =7.69 第第第 1.第第第第第第第第第第第第第第第第第第第第第第 110.5cm第第 2. 第第第第第第第第第第第第 3. 第第第第第第第第 第第第第第第 第第第第第 n=4第第第第第 R= 69mm第第第第第第第第 L= 12mm第
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