农业机械学43

农业机械学43

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试试试试试试试试试试试试试试试试试试试试试试 75% 试试试试试试试试试试试试试试试 试试试试试试试试试试 A B L l a b 75% L≥l + a B≥b A≥2a 试试试试试试试试试 =0.75-1.5 mm
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试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试 试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试 试试试试试试试试 试试试试——试试试试 试试试试试——试试试试试试试试试试试试 试试
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2 试试试试试试试试试试试试 V p 试试试 试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试试 试试试试试试试试试试试试试试试试 V p →t↓→ 试试试试 ↓试 V p ↓→t↓→ 试试试试↑→ Q↓ 试试试试试试试试试试试试试试试试试试试试
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农业机械学43

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