题目在铁碳合金相图中,共析点S对应的含碳量是()A. 0.0218%B. 0.77%C. 2.11%D. 4.3%在铁碳合金相图中,共析点S对应的含碳量是()A. 0.0218%B. 0.77%C. 2.11%D. 4.3%题目解答答案B. 0.77%