你在使用水性笔解答中考试题时，水性笔中的墨水保持不变的物理量

你在使用水性笔解答中考试题时，水性笔中的墨水保持不变的物理量是（　）

A．质量　B．密度 C．重力　D．体积

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你在使用水性笔解答中考试题时，水性笔中的墨水保持不变的物理量

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