当前学科:船舶动力装置
  • 题目: 单选
    Crankshafts of medium speed engines are () from a single piece of steel.

      A . unusually solid welded
      B . never be solid forged
      C . almost invariably solid forged
      D . almost invariably be welded

    答案: <查看本题扣1积分>

    查看答案

    答案不对?请尝试站内搜索