索引《Oracle 物料清单管理系统帮助》 ... Dates（日期） effective from and effective date（有效起始日期和有效日期） effective to and inactive after（有效截止日期和无效日期） ...
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effective earth radius 有效地球半俓 ; 等效地球半径
effective earth-radius factor 等效地球半径系数
effective earth pressure 有效土压力
effective earth s radius 等效地球半径
effective earth ' s radius 等效地球半径
effective earth curvature factor 有效地球曲率因数
effective radius of the earth [地物] 等效地球半径 ; [地物] 有效地球半径
effective radius of earth 地球有效半径 ; 等效地球半径
The radial-tracing algorithm and the effective earth model are discussed.
讨论了大气折射的射线追踪算法和等效地球模型；
Application of effective earth radius and methods to derive it are discussed.
对有效地球半径的推导方法和应用进行了讨论。
The eco-light is good for earth, and it's cost-effective and convenient, because it doesn't have to be changed every few months.
环保灯对地球来说是好的，而且它很省钱、方便，因为它不需要每隔几个月就更换一次。
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