题目内容

关于作物发育期观测次数和时间，以下正确的是（）

A. 发育期一般逢3、和8日观测。
B. 禾本科作物抽穗、开花期每日观测。
C. 规定观测的相邻两个发育期间隔时间很长，可停止观测，临近发育期即恢复隔日观测。
D. 观测时间一般定为上午。

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