正确答案: D

闪光融合

题目：电风扇高速转动时，人们看到的不再是一扇一扇的叶片，而是一个整体的圆盘在旋转，这种现象反映的是

解析：D

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举一反三的答案和解析：

[单选题]The reason why women and blacks play down their visibility is that they ______.

don't want people to think that their promotions were due to sex or color

解析：答案：B

[单选题]

on

解析：答案：D

[多选题]

6-巯基嘌呤B．氮杂丝氨酸

甲氨蝶呤

解析：113．答案：D