| Front | 有若干根不均匀的绳子，每根绳子点燃一头的烧完时间是一个小时，用什么方法确定一段1小时15分钟的时间? （请回答最少需要几根绳子） There are a number of uneven ropes, each rope lit end of the burn out time is an hour, what method is used to determine a section of 1 hour and 15 minutes? (Please answer the minimum number of ropes needed) |
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| Back | A 1. B 2. C 3. D 4. |
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