Permanent reference number 固定参考号码
GPS permanent reference station GPS永久性参考站
Permanent Zinc Reference Electrode 锌参比电极
·2,447,543篇论文数据，部分数据来源于NoteExpress
More permanent reference stations are being installed to provide wider and more precise coverage.
测绘处现正设立更多的永久参考站，以扩大覆盖范围及提高精确程度。
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