1, engineering problems are generally based on the total workload "1"; The total distance is generally considered as the unit "1" in the travel problem. That is, look at the score or percentage of known conditions, and who is the unit "1". If there are two quantities, either one can be regarded as the unit "1".

2. Think of the method of generating the relationship as the unit of "1", such as sawing a 3-meter-long wood into 4 sections on average. The unit "1" is the length of wood, that is, 3m is the unit "1".

Dear, the specific application still needs to be discussed in the topic, so I have to help you here.