单项选择题
A.投资债券 B.投机债券 C.垃圾债券 D.巨灾债券
A.凭证式国债 B.记账式国债 C.储蓄国债 D.电子式国债
A.106.60 B.103.21 C.102.28 D.105.11
A.50 B.51.25 C.52.5 D.51.27
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