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【单选题】
夫琅和费单缝衍射图样(条纹)的特点是A.
各 级明条纹亮度相同
B.
各级暗条纹间距不同
C.
中央的宽度两倍于其他的宽度
D.
当用照射时，中央两侧为由红到紫的彩色条纹
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举一反三
【单选题】Since entry into high school the students have been ____ staying up late in the evening and getting up early in the morning.
A.
admitted to
B.
allergic to
C.
accustomed to
D.
attached to
【单选题】I was surprised that she was late, ______ since she usually arrived early.
A.
specially
B.
especially
C.
extraordinarily
D.
particularly
【简答题】距离保护是利用正常运行与短路状态间的哪些电气量的差异构成的?
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