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【单选题】
用单色光作杨氏双缝实验,双缝间距为 0. 5 mm ,在距离双缝 2.0m 处的屏上出现干涉条纹, 测得相邻明纹间的距离为 2.0mm ,则该单色光的波长为( )A.
500.0nm
B.
544.8nm
C.
600.0nm
D.
700.0nm
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举一反三
【单选题】The story was said to have been based on the information from a reliable ________.
A.
source
B.
foundation
C.
origin
D.
basis
【单选题】Based on information in the passage,the reader can conclude Violet' s primary source of conflict stems from her____.
A.
not being fluent in Chinese
B.
difficulties with her schoolwork
C.
parents being extremely strict
D.
family's move to Washington State
【简答题】电弧焊用的电极有____电极 和____电极两种。
【单选题】Traditionally, jurors form. their judgment based on______.
A.
lawyers' oral evidence
B.
source documents
C.
case memo
D.
detailed supporting evidence
【单选题】调查林业生产条件的目的就在于了解森林经理对象的客观条件,掌握林业生产中的自然规律和经济规律,为森林经理工作编制( )提供依据。
A.
林业规划
B.
年度计划
C.
森林经理等级
D.
森林经营方案
【简答题】电弧焊用的电极有( )和( )两种。
【单选题】The telegram was based on information from a _________ source.
A.
recent
B.
reliable
C.
rare
D.
private
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