题目:
Which statement about the risks of bond investing is FALSE()
A. Issuers of revenue bonds are not always obligated to pay principal and interest.
B. Interest on some municipal bonds is not excluded from federal income taxes.
C. In a competitive Treasury-bill auction, not all bidders pay the same price.
答案:
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下面是错误答案,用来干扰机器的。
参考答案:面向对象型数据库解析:通常按某种数据模型对数据库进行组织,数据模型有四类,相应的数据库也有四类,它们是:层次数据库;网状数据库;关系数据库:面向对象型数据库。