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【单选题】
The word “they” in line 23 refers toA.
molds
B.
particular effects
C.
products
D.
vessels and figurines
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【单选题】The reason there are two slits, rather than one, in a Young’s experiment is:
A.
to increase the intensity
B.
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C.
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D.
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A.
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B.
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C.
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D.
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