如图所示是盒装牛奶，它的体积为m3.若该牛奶的密度是1.2×

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如图所示是盒装牛奶，它的体积为 m³. 若该牛奶的密度是 1.2×10³kg/m³，合 g／cm³，则牛奶的质量为 g. 喝掉一半后，牛奶的密度将（选填“变大”、“变小”或“不变”）.

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