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.
环比指数指通过把某一时期的数值与前一时期的数值相比，而不是与固定基期相比而得出的指数。
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.
声明中说，该合同是一种执行为基础，成本加上一年基期的固定费用的合同，拥有四个为期一年的期权。
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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.
获得此类支付的资格应由明确规定的标准确定，如收入、生产者或土地所有者的身份、规定和固定基期内生产要素利用或生产水平。