机械基础试题(2.5*24=60分)1.平面四杆机构无急回特性时_______,行程速比 系数 _______(A)压力角α=0 (B)传动角β=0 (C) 极位夹角θ=0(D) k>1 (E)k<1 (F)k=12.在双曲柄机构中,已知三杆
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