Could you please tell me _____ get to the railway station?     [ ]

A. where can I      

B. how can I      

C. where I can    

D. how I can

刃磨拉刀的前刀面时，限制砂轮直径的目的是保证前角的正确加工，否则将干涉拉刀的刀齿廓形。