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【多选题】
自准法中为了减小实验误差,准确测得薄凸透镜的焦距,应该进行如下哪个操作?A.
多次测量求平均
B.
将透镜反转180度，重复测量
C.
保证光路的等轴
D.
保证光强的大小
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【单选题】第三段：To determine what orientation information S. satyrus extracts from the starry sky—despite the theoretical limitations of its visual system—we moved our wooden arena into the Johannesburg planetari...
A.
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B.
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C.
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D.
Future experiments
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