The important sign of physiological maturity of corn is （）.
The important sign of physiological maturity of corn is （）.
A.Bract leaves turn white
B.Stems and leaves turn yellow
C.Milk line disappears， and black layer appears
D.Grain hardens
正确答案：Milk line disappears， and black layer appears
Tag：CropCultivationScience
时间：2022-02-28 15:25:15
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