当前学科:船舶动力装置
  • 题目: 单选
    The mechanical efficiency of an engine () because losses occur in the form of friction.

      A . is always less than 100%
      B . is always more than 100%
      C . is always equal to 90%
      D . is always less than 90%

    答案: <查看本题扣1积分>

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