- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
立式下芯頭的斜度一般為（）左右
A.3°
B.5°
C.12°
D.10°
A.3°
B.5°
C.12°
D.10°
