当前学科:汽轮机本体检修工(高级)
  • 题目: 单选
    普通碳素钢的含硫量不大于()%,含磷量不大于()%

      A . 0.055,0.045
      B . 0.045,0.04
      C . 0.05,0.06
      D . 0.045,0,05

    答案: <查看本题扣1积分>

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