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国际习用原点
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国际习用原点
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conventional international origin;CIO
国际习用原点
为了统一全球地面坐标系统和便于研究极移,1967年国际天文学联合会(IAU)、国际大地测量和地球物理联合会(IUGG)决定采用统一的地极坐标原点,称为国际习用原点。
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ultraparabolic
ultraparabolic differential equation
ultraparabolic equation
ultraparallel lines
ultra performance liquid chromatography
ultra performance liquid chromatography (UPLC) for pharmaceutical analysis
ultraperiodic
ultraphosphate
ultraphotic rays
ultraporcelain
ultrapower
ultra-precision cutting of single crystal brittle material assisted with ion implantation
ultra-precision cutting of surface-modified carbon steel
ultra-precision grinding of brittle materials
ultra-precision machining
ultra-precision machining of optical spherical and freeform surface
ultra-precision manufacturing of optical surfaces
ultra-precision mechatronics system
ultra-precision opto-mechanical system
ultraproduct
ultraproduct technique
ultraproduct theorem
ultra-pure materials
ultrapure water
ultrapurification of materials
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