BAFFBFNFNCFFNDFNFD2()ABCDDABCDBC.BC4()ABCDBD5.v1BAv1v2ABBv1>v2BACv1v2ABv1v2ABAv1>v2BABABAB Dv1FN>FNFf>Ff>FfACFND.D80.120kg10N(g)B10ND20NFFNmg0.12010N20N10N/kg)(A10NC20NmAmgBFCFDFmgmgABFNFCFDACD10mABF1mF2F1F2()AF1F2BF1F2DFFNAF2m/sA11(1)F⑵F⑶()FFNGFfFNG.FN(1)G⑵G(3)G123.0kgF18.0NF210.3N(1)⑵8.0N⑶12.0N(1)F210.3NF2Ff1Ff1F210.3NFNmgFFNFf1FNFfIFN10.339.80.35.10.3Ff2F18.0N.(3)F312.0NFf2Ff1(1)0.35(2)8.0N(3)10.3N(2)F28.0NFf2F1