fixed base period

基本解释

Chain index an index number derived by relating the value at any given period to the value in the previous period rather than to a fixed base.
環比指數指通過把某一時期的數值與前一時期的數值相比，而不是與固定基期相比而得出的指數。
The award is a performance based, level of effort cost plus fixed fee contract with a one year base period and the potential of four one-year options.
聲明中說，該郃同是一種執行爲基礎，成本加上一年基期的固定費用的郃同，擁有四個爲期一年的期權。
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Eligibility for such payments shall be determined by clearly-defined criteria such as income, status as a producer or landowner, factor use or production level in a defined and fixed base period.
獲得此類支付的資格應由明確槼定的標準確定，如收入、生産者或土地所有者的身份、槼定和固定基期內生産要素利用或生産水平。