Due to the lifecycle of regenerative resources, there must be an optimalperiod to exploit them for maximum profits.
由于可再生资源具有生命周期，因此从经济收益的角度来讲必然存在一个最优开采期。
2
Whether the flowers of Rosa rugosa Thunb treated with 1125 were dry or fresh, the optimalperiod was the flower bud stage.
经1125处理的玫瑰，无论是干花还是鲜花，适采期均为蕾期，比对照提前1天。
3
Using the property of Markov at the points of replacement period, a model of determining the optimalperiod is developed with objective of maximizing the mean time to first failure of system.