题目钢的含碳量一般为()A. 0.0218~2.11%B. 0.0218~6.69%C. 0.0218~4.3%D. 0.0218~0.77%钢的含碳量一般为()A. 0.0218~2.11%B. 0.0218~6.69%C. 0.0218~4.3%D. 0.0218~0.77%题目解答答案A. 0.0218~2.11%