by useful信息详情
按有用
useful───adj.有用的，有益的；有帮助的
useful charts───有用的图表
useful tips───有用的提示
a useful───有用的
useful idiots───有用的傻瓜
useful book───有用的书
very useful───非常有用的
useful life───有效期，有效寿命；使用寿命；有效期
useful thing───有用的东西
reliability of GM counter tubes should be described by useful time before failure life and failure rate during life.───GM计数管的可靠性应当以失效的工作时间-寿命，以及在寿命期间的失效率来表征。
ration of the element's content and the lowest industrial grade can be used to determine whether the deposit be formed by useful materials or not.───有用物质可否成为矿床，取决于某元素含量与最低工业品位的比值。
I've lived through many "savage" times, without the direction provided by useful metrics in my process, and it's no pleasure.───我经历过很长时间的“野蛮”时期，缺少有用指标对我的过程的指导，而且没有快乐可言。
Furthermore, substantial progress has been made, helped by useful background papers from the International Monetary Fund.───此外，国际货币基金组织（IMF）的背景报告帮助取得了重大进展。
Reduce cost by useful methods; control and continually improve purchasing processes.───运用方法来降低成本，控制并持续改进采购过程；
Negative value basically is by " useful labor " blemish sex, limitation and certain ruinous form.───负价值主要是由“有用劳动”的缺陷性、局限性和某些破坏性形成的。
I've lived through many "savage" times, without the direction provided by useful metrics in my process, and it's no pleasure.───我经历过很长时间的“野蛮”时期，缺少有用指标对我的过程的指导，而且没有快乐可言。
The reliability of GM counter tubes should be described by useful time before failure life and failure rate during life.