For objects of class Rational, overload the unary operator " - ", and the declaration of the operator function is_______ A: void Rational::operator-(); B: friend Rational operator-( ); C: Rational Rational::operator-() D: friend void operator-( Rational a );

rational people

现在，Rational Rose是属于Rational公司的产品，它是一款[ ]工具。

Which of the following statement is true? ( ). A: Rational people know that decisions in life are really black and white. B: Rational people know that decisions in life are rarely black and white. C: Decision-making is very easy for rational people. D: When rational people make decisions in life, they are very certain of the choice.

中国大学MOOC: Both of procrastinators and non-procrastinators have a Rational Decision Maker, which is responsible for making the rational decision.

It is assumed that a rational decision maker ________.

概念题：理性选择（ rational choice）

First impression is produced by rational judgments not by emotional ones.

试述如何使用Rational Rose生成代码。

Rational Rose模型文件的扩展名为____________。