农业机械学75

农业机械学75

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1 .......... . 1 ... . 2 ... .... .................. Hd.x .... ................ Hd.y .... Hd ......... Hd=Hd.x+Hd.y . 3 ... a . .... Nx ....... b .... Nz ........... c ..... Np . 4 ..... η
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农业机械学75

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