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中国鄂西地区的一套由黑云斜长或二长片麻岩、斜长角闪岩、云母石英片岩、变粒岩、浅粒岩、富铝质或含石墨质的片麻岩与片岩、大理岩、钙硅酸盐岩及石英岩等组成的变质岩群。
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primary standard machine of vickers hardness
primary standard material
primary standard of absorbed dose to water
primary standard of air kerma
primary standard of angle metrology
primary standard of diffuse transmitted visual
primary standard of exposure
primary standard of flatness
primary standard of illuminance
primary standard of laser small angle
primary standard of laser wave length
primary standard of length
primary standard of line angle
primary standard of luminance
primary standard of luminous exposure
primary standard of luminous intensity
primary standard of microwave phase shift
primary standard of multi-teeth index table
primary standard of spectral irradiance
primary standard of spectral radiance
primary standard of taper gauge
primary standard of total luminous flux
primary standards of national defense
primary star
primary station
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