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活性指数 huóxìng zhǐshù
oil	index of activity
oil.proc.	activity index
tech.	activity number
土的活性指数 huóxìng zhǐshù
archit.	activity number (塑性指数与黏土成分之比)
活性指数塑性指数与黏土成分之比 huóxìng zhǐshù
eng.geol.	activity number

活性指数: 10 phrases in 5 subjects

Desert science	1
Oil / petroleum	3
Statistics	1
Technology	3
Water resources	2