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permissible concentration
agric. 许可浓度
ecol. 容许浓度
met. 允许浓度
permissible concentration
: 35 phrases in 13 subjects
Agriculture1
Animal husbandry1
Chemistry1
Desert science1
Earth sciences5
Ecology1
Environment2
General2
Metallurgy2
Nuclear physics1
Oil / petroleum1
Technology15
Water resources2

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