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卫星电视
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vacuum evaporator
vacuum expectation value
vacuum-extraction of the fetus head for midwifery
vacuum field
vacuum filter
vacuum filter equipment
vacuum filtration of mineral processing products
vacuum flask
vacuum fluctuation
vacuum fluorecent display
vacuum fluorescence
vacuum forming
vacuum freeze dryer
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vacuum generator
vacuum glass
vacuum graph
vacuum grating spectrograph
vacuum heater
vacuum heat treatment
vacuum heat treatment technology
vacuum impregnating
vacuum induction sintering furnace
vacuum infiltration transformation
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