题目内容

某标准蜗杆减速器的蜗轮已丢失，测知蜗杆头数z1=2，螺旋导程角γ=14°02′10″（右旋），模数m=8mm，中心距a=240mm。蜗杆的齿顶圆直径da2应为（）

A. 416mm
B. 424mm
C. 432mm
D. 440mm

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