<span><span style、" font-family: 宋体;">FIRR<sub>A</sub>>FIRR<sub>B</sub></span></span>
<span><span style、" font-family: 宋体;">FIRR<sub>A</sub><FIRR<sub>B</sub></span></span>
<span><span style、" font-family: 宋体;">FIRR<sub>A</sub>与FIRR<sub>B</sub>的关系不确定</span></span>
<span><span style、"font-family: 宋体;">FIRR<sub>A</sub>=FIRR<sub>B</sub></span></span>