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equivalent per million
agric. 百万分之一当量 (epm)
chem. 每百万当量数; 百万分之几当量数
tech. 百万分之一当量
equivalents per million
earth.sc. 百万分之一当量
equivalent per million: 8 phrases in 4 subjects
Electronics3
General1
Oil / petroleum1
Technology3