题目内容
一对标准斜齿圆柱齿轮传动，Z1=27，Z2=60，法面模数mn=3mm，螺旋角β=15°，试求两轮的分度圆直径和理论中心距，若将中心距取为135mm，而两轮的模数和齿数均不变，此时螺旋角β应为多少？
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