nominal characteristic impedance

例句：

1. 1.The nominal value of the stock is $50 million.
   该股票的名义价值为5亿美元。
2. 2. The nominal interest rate is 4%.
   名义利率为4%。
3. 3. The nominal salary does not cover living expenses.
   名义薪水不足以支付生活费用。