1.[]低碳钢的含碳量应为下列哪项?【2010-57】A.小于0.25% B.0.25%~0.6% C.0.6%~1% D.1%~2%ABCD
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参考答案:A
参考解析:低碳钢的含碳量为0.06%~0.25%,含锰量为0.25%~1%,含磷量不超过0.04%,含硫量不超过0.05%。中碳钢的含碳量为0.25%~0.55%,含锰量为0.30%~1.00%,含磷量不超过0.04%,含硫量不超过0.05%。高碳钢的含碳量为0.60%~1.03%,含锰量为0.30%~0.90%,含磷量不超过0.04%,含硫量不超过0.05%。