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找一个空罐头盒封好并焊上气门咀,称其质量为 m_1.用气筒向内打气,后称其质量为 m_2,算出打进空气质量Δm=m_2-m_1.
Find an empty cans sealed and welded on the valve Tsui, saying the quality of m_1. Pump inward inward cheer, after the mass was called m_2, calculated into the air quality Δm = m_2-m_1.