单选题：He cannot discriminate between a good idea and a bad one.

题目内容：

He cannot discriminate between a good idea and a bad one. A．judge
B．assess
C．distinguish
D．recognize

参考答案：

答案解析：

设有关系R和S，关系代数表达式为R一(R—S)表示的是（　　）。

设有关系R和S，关系代数表达式为R一(R—S)表示的是（　　）。A．R∩S B．R—S C．RUS D．R÷S

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