施用钾肥能增强农作物的抗倒伏能力．下列物质可用作钾肥的是A．

施用钾肥能增强农作物的抗倒伏能力．下列物质可用作钾肥的是

A． NH₄HCO₃	B． K₂CO₃
C． CO（NH₂）₂	D． Ca（H₂PO₄）₂

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