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进行物质流动定量分析应遵循以下哪种定律（） Which of the following （) should be obeyed in quantitative analysis of material flow（）
A．物质守恒定律 Law of mass conservation
B．牛顿运动定律 Newton's law of motion
C．热力学定律 Law of thermodynamics
D．生态学定律 Law of ecology
参考答案和解析
物质守恒定律
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名词解释题传媒的定量研究（Quantitative Analysis）
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