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%
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%
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