Some parameters chain may deviate from the expectancyvalue or average in the supply chain, such as demand, price, cost, and so on, and then there is a variance risk.
Rising life expectancy and worries about the value of pensions mean the trend to work will continue.
人们对生活的期望越来超高,愈加担心养老金的价值,因而工作趋势将持续。
3
This paper introduces several methods for improving the life expectancy of mine hoisting cable, which have the practical reference value for the safety in production of coal mine.