问题如下图：
选项：
A. 
B. 
C. 
老师 能不能详细讲一下这道题
解释：
NO.PZ2018062007000061 如标题
想问下A怎么翻译？the nationprincipsw不是交换利率的一种swap，这样翻译吗？我们视频不是说这种swap交换利率，本金保持和银行借款的本金一致这样吗?
老师问下c怎么理解 为什么错啊
a fixeamount whenever it is matchewith a loan. equto the amount oweone swparty to the other. A is correct. The notionprincipof a swis not exchangein the case of interest rate swap. B is incorrebecause amortizing lowill matchewith a swwith a pre- specifieclining (not fixe notionprincipthmatches the lobalance. C is incorrebecause the notionprincipis equto the lobalance. Although the lohactubalan(the amount owethe borrower to the cretor), the swes not have sua balanoweone swparty to the other. b错误在哪？能分析下吗
