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[单选题]
在杨氏双缝实验中，测得相邻明纹中心之间的距离为0.4mm.若使两缝间的距离减小为原来的一半，使缝到观察屏的距离也减小为原来的一-半， 其他实验条件不变,则观察屏_上相邻明纹中心之间的距离为
A
0.2mm
B
0.4mm
C
0.6mm
D
0.8mm
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试题答案：
B
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热门试题
1.
There were once many sheiks（阿拉伯的酋长）who wanted to marry Queen Maura, for she was one of the most beautiful powerful queens of Arabia.However, she did not like most of the sheiks, soon there were only three left on her list of possible husbands.These three sheiks were all equally young handsome, rich strong.It was very hard for the Queen to choose the best one.One evening, she disguised herself went to where the three sheiks were having their evening meal.She asked them to give her something to eat.The first sheik gave her some stale（不新鲜的）food left over from the day before.The second sheik gave her a tough piece of old camel's tail.The third sheik, whose name was Hakim, gave her some of the most tender（嫩的）tasty meat.After the meal, Queen Maura left the sheiks' camp.The next day, she invited the three sheiks to dinner at her palace.She told her servants to give each sheik what he had given her the evening before.Hakim, who received a plate of tender tasty meat, would not eat it unless the other two sheiks could share it with him.Queen Maura was now certain which of the sheiks she wanted to marry."Hakim is the most generous of you," she told them, "so I want to marry him he will become king."The queen was looking for a husband.A、TB、F
2.
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3.
查看材料在这一片段中作者运用了哪些修辞方法来说理论事，其作用如何?
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We must____ the importance of the four modernizations.
5.
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