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【单选题】
如图,用单色光垂直照射在观察牛顿环的装置上,当平凸透镜垂直 向上缓慢平移而远离平面玻璃时,可以观察到这些环状干涉条纹( )A.
向中心收缩
B.
向右平移
C.
扩张
D.
静止不动
E.
向左平移
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A.
that
B.
where
C.
which
D.
when
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A.
take; to play
B.
cost; playing
C.
spent; on
D.
spend; playing
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A.
take part on,enough
B.
take,enough
C.
take part in,much
D.
take part in,enough
【简答题】There are a lot of easy-to-do hobbies, such as ().
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