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• The filters are interposed (or put, or placed) in the beam.
• Various thicknesses of some material are placed across a beam of beta rays.
Русско-английский научно-технический словарь• The filters are interposed (or put, or placed) in the beam.
• Various thicknesses of some material are placed across a beam of beta rays.
Русско-английский научно-технический словарь