SAP智力題 Day and night

You fall into a cave and you don’t know it is day or night at the moment. You know there are 4 spirits in the cave, they are:
Spirit A speaks truly during the day and night;
Spirit B speaks falsely during the day and night;
Spirit C speaks truly during the day and speaks falsely during the night;
Spirit D speaks falsely during the day and speaks truly during the night;
When you ask questions, the spirits answer only “day” or ”night”. If the answer is not day or night, they answer randomly. Now you meet one spirit, can you identify it with two questions?
----Designed by Hansen Chen in 2009( https://www.sdn.sap.com/irj/scn/forum?forumID=410 )

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• 回複：SAP智力題 Day and night -屋漏痕- ♂ (577 bytes) () 08/05/2009 postreply 06:30:46