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1,2,3,4,6-1,5,lmin+lmax=150+500300+400 (mm),6,6-5,已讲 (a) AB + e BC (b) AB长度不限 ,7,8,9,10,6-11,本图CD长度错了! (按CD=75毫米作图了),11,12,13,6-12,14,15,16,Shi pin,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,