应优先选择()开展物质人为流动分析 When we carry out a material anthropogenic flow analysis
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应优先选择()开展物质人为流动分析 When we carry out a material anthropogenic flow analysis, the priority should be given to ()
A.具有较低毒性的物质 The substances with low toxicity
B.具有较高毒性的物质 The substances with high toxicity
C.没有毒性的物质 The substance without toxicity
D.物质毒性在环境中保持不变的物质 The substance with constant toxicity

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物质守恒定律
