如圖所示;用游標(biāo)深度尺測得55°的燕尾槽的深度是40mm,用直徑為30mm的圓棒做測量棒,測得兩圓棒之間的距離為20.40mm,求燕尾槽槽底A和槽口B的寬度()。
A.102.36mm,56.17mm B.115.40mm,53.80mm C.77.60mm,48.20mm D.108.03mm,52.02mm
A.40m/s B.40m/min C.400m/min D.19.782m/min