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W>W Quanto é 19 vezes 8, dividido por 18? - What was the objective of the experiment described in the text? To understand the formation of stationary waves for sound waves. To verify the ph...>What are the main sources of recruitment? a) School recruitment, professional recruitment, university recruitment, intern recruitment, class asso...atéWhat are the main types of sampling systems for air pollutants? I- Active systems force air to pass through a collection support using a suction p...