问题：
[单选题]一蜗杆传动,已知模数m=4mm, 蜗杆头数=1, 蜗轮齿数=50,特性系数q=10,则该传动中心距a等于( )mm。
A、124
B、125
C、120
D、130 E.140
参考答案：
B
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