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【单选题】
键槽长度(右)( )。A.
在公差范围内
B.
不在公差范围内
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【单选题】How many people _____ church every Sunday? [ ]
A.
join
B.
attend
C.
take
D.
take part in
【单选题】Many people believe that ______ will take years to develop a car that does not pollute the air. [ ]
A.
it
B.
that
C.
there
D.
this
【简答题】Many people take trains for their trips in China, because the train is fast and cheap. But there are many problems when people take trains. It’s not easy to take trains when it is a festival. Lots of ...
【单选题】在单缝的夫琅和费衍射实验中，若减小缝宽a，其他条件不变，则中央明纹【图片】
A.
宽度变小
B.
宽度变大
C.
宽度不变，且中心强度不变
D.
宽度不变，但中心强度变小
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