题目发生共晶转变的含碳量的范围是()A. .0.77%—4.3%B. .2.11%—4.3%C. .2.11%—6.69%D. .4.3%—6.69%发生共晶转变的含碳量的范围是()A. .0.77%—4.3%B. .2.11%—4.3%C. .2.11%—6.69%D. .4.3%—6.69%题目解答答案C. .2.11%—6.69%