若甲代表人类社会,乙代表自然环境,则箭头a表示 A.利用风力发

若甲代表人类社会,乙代表自然环境,则箭头a表示

A.利用风力发电

B.排放工业三废

C.排放余热

D.开山采石

答案

BC

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