- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
低碳鋼的含碳量范圍是（）.
A.≤0.04%
B.0.04～0.25%
C.0.25～0.60%
A.≤0.04%
B.0.04～0.25%
C.0.25～0.60%
