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period of validity
[经] 有效期
period of validity
period of variable star
period of vibration
period of vigorous ec...
period of wave
period of waves
period of yolk format...
period oscillator
period parallelogram
period parallelotope
period per second
period piece
period planning
period point
period project
period range
period ratio
period reaction
period region
period regulator
period relation
period resolution
period run
period section steel
period shut-down
period strip
period to period grow...
period under review
period vector
period-amplitude rela...
period-and-level star...
period-density relation
period-eccentricity r...
period-luminosity curve
period-luminosity rel...
period-luminosity-col...
period-mass relation
period-mean density r...
period-redius relation
period-spectrum relation
period-to-period valu...
periodate
periodate ion
periodate lignin
periodate oxidation
periodate oxidized ce...
periodate titration
periodates
periodental curette
periodental ligament
periodental membranes
periodic
periodic abdominalgia
periodic accounting
periodic acid
periodic acid oxidation
periodic acid-Schiff ...
periodic acid-Schiff ...
periodic acid-Schiff ...
periodic acid-Schiff'...
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