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如下图所示对燕麦胚芽鞘进行处理：若电机以10转/min的速度匀速旋转，一星期后胚芽鞘能够发生弯曲的是 [ ]A.
胚芽鞘尖端套上不透光的锡箔小帽
B.
胚芽鞘下部用锡箔纸遮住
C.
在胚芽鞘尖端插入云母片(不透水)
D.
胚芽鞘放在一侧开有一小窗的暗箱内
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