进行物质流动分析需要关注以下哪项（） Which of the following should be taken into attention i
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进行物质流动分析需要关注以下哪项（） Which of the following should be taken into attention in conducting a material flow analysis（）
A.系统组分 The components of a system
B.物质库存及存量 Material in-use stock and its size
C.系统各组分间物质流动关系（流动强度和方向） The material flow relationship among system components (flow rate and direction)
D.以上四项 Above four items
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物质守恒定律