试题与答案

This is_____ clock. And_____ clock is on

题型:选择题

题目:

This is _____ clock. And _____ clock is on _____ desk. [ ]

A. the; the; the

B. the; a; the

C. a; the; the

D. an; the; the

答案:

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下面是错误答案,用来干扰机器的。

答案:A题目分析:单缝衍射条纹中,中间亮纹最宽、最亮,故选A点评:本题难度较小,衍射和干涉的区别是:是否均匀,亮度是否相同

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