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【多选题】
(tt10)对惠更斯原理的认识正确的是 ( )
A.
提出了子波的概念；
B.
可以解释衍射强度分布不均的现象；
C.
可以解释波的传播方向的问题；
D.
通过绘图法，由t时刻波阵面画出t+Δt时刻的波阵面。
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举一反三
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1932
B.
1945
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1920
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1987
B.
1967
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【单选题】Which of the following statements is true of libraries in the UK?
A.
The library is sacrificing books in favor of internet access and other facilities.
B.
More and more people go to the library reading a book.
C.
There are more and more computers in the library to facilitate the book index for the readers.
D.
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【单选题】羽毛球运动是什么时候传入我国的( )。
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1920 年
B.
1930 年
C.
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D.
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【单选题】Mary does not read newspapers she reads Shakespeare, ______.
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therefore
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They will not be charged at all.
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【单选题】— How many people are there in the library? — _______. The library is not open today. [     ]
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【单选题】羽毛球运动是( ) 年 时传入我国的。
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The library is sacrificing books in favor of internet access and other facilities.
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