亚共析钢的含碳量范围是：（)A.0.0218% ~ 0.77%C;B.0.0008% ~ 0.0218%C;C.2.11% ~ 4.3%CD.0.77%

亚共析钢的含碳量范围是：()

A.0.0218% ~ 0.77%C;

B.0.0008% ~ 0.0218%C;

C.2.11% ~ 4.3%C

D.0.77% ~ 2.11%C;