某改良玉米总产值为50000元,种植面积为50亩,消耗的总生产成本为20000元,其中生产费用为15000元,则单位面积的纯收益为
A.300元/亩
B.600元/亩
C.700元/亩
D.1000元/亩
正确答案是B
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