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〔原子物理基本概念和量〕
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proportional regulatory systems
proportional relation
proportional relations among agriculture,light industry and heavy industry
proportional relations among primary industry,secondary industry and tertiary industry
proportional representation
proportional sampling
proportional selection
proportional sequence
proportional stratified sampling
proportional subclass number
proportional trapping
proportional valve
proportional variable
proportion by addition
proportion by addition and subtraction
proportion by alternation
proportion by subtraction
proportioner
proportion of nonconforming items
proportion of piped onto premises
proportion of soil erosion control
proportion of wind and solar power generation in electricity production
proportion relationship between accumulation and consumption
proportion relationship between two-major parts of social production
proportion with equal means
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