单位成本(元/件)关于产量(件)的回归方程y=180-0.25x的经济含义是( )。
A.产量每增加1件,单位成本平均增加0.25元
B.产量每增加1件,单位成本平均降低0.25元
C.产量每减少0.25件,单位成本平均降低180元
D.产量每减少0.25件,单位成本平均增加180元
正确答案是B
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