• 2022-06-14
    亚共析钢的含碳量范围是();过共晶白口铸铁的含碳量范围是()。
    A: 4.3%~5.69%0.0318%~0.77%
    B: 4.3%~6.69%0.0218%~0.77%
    C: 0.0218%~0.77%4.3%~6.69%
    D: 0.0318%~0.77%4.3%~5.69%