- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
V形鐵用碳鋼制成，淬火后經(jīng)過磨削加工，V形槽呈（）.
A.105°
B.90°
C.75°
D.60°
A.105°
B.90°
C.75°
D.60°
