(单选题)3: 下列风险中属于系统风险的是（ ）。
A: 比较风险
B: 利率风险
C: 未来运营费用风险
D: 持有期风险
一、选择填空：阅读下面的对话或句子，从A、B、C三个选项中选出一个能填入空白处的最...
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