基于当前参考基准的官方生产者物价指数数据在以前的指数参考基准期是不可用的。
Official PPI data based on the current reference base are not available on previous index reference base periods.
Firefox:完整的基于XML的浏览器参考基准。
从概念模型的角度探讨了GPS和电子地图的参考基准问题。
This paper approaches the reference datum of GPS and electronic map from concepts model, and analyses the basic relations of coordinate transformation.
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