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active area
active army of laborers
active articulator
active atmospheric remote sensing
active atom
active attack
active aurora
active autofocusing
active backplane
active binary
active bio-fertilizer
active block theory
active brazing
active bridge
active carbon
active carbon; activated charcoal
active carbon fiber
active carbon filter medium
active carbon trap
active cavity
active cavity radiometer
active center
active center of gravity control
active centre
active chromosphere
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