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period of renewal
续展期间
专利
period of renewal
period of reservior w...
period of responsibility
period of retention
period of revolution
period of S.H.M.
period of sampling
period of satellite
period of saturation
period of schooling
period of service
period of slack sales
period of slow-wave s...
period of state
period of stay
period of stipulatad ...
period of storage
period of tillage
period of time
period of transformation
period of transition
period of uncovering
period of use
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
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