某国库券还有半年到期，面值100元，现在价格96元，投资该国库券获得的等价收益率为（）。

A．Ⅰ型 B．Ⅱ型 C．Ⅲ型 D．Ⅳ型 E．Ⅴ型 点击查看答案

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.It is more and more usual that users of Information Retrieval(IR)systems must face up to response of hundreds or thousands of(66)documents. A significant proportion of them are moreover(67)or redundant. This is a straight consequence of two well - known facts: the incessant growing of documental databases and the lack of ability of most users to define(68)information needs. In such a framework, further effective retrieval techniques are only part of the solution. Interfaces with alternative ways for organizing and(69)the results returned by a(70)would be of great utility assisting users to find relevant documents. Document clustering may play a central role as an effective technique for organizing query results.A．repliedB．retrievedC．receivedD．relied 点击查看答案