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【判断题】
管蚜 孕穗期防治指标—有蚜株率50%左右,百株平均蚜量200-250头。
A.
正确
B.
错误
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【单选题】需求曲线可以从()导出
A.
价格-消费曲线
B.
收入-消费曲线
C.
无差异曲线
D.
预算线
【单选题】需求曲线可以从( )导出
A.
价格——消费曲线
B.
无差异曲线
C.
收入——消费曲线
D.
预算线
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