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【简答题】
在天平上重复称以重量为a的物品,假设各次称量的结果相互独立,且服从正态分布 需至少反复称量多少次
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举一反三
【单选题】Energy crisis The year 1973 brought an end to the era of secure, cheap oil. In October, as a result of the Arab Israeli War, the Arab oil-producing countries cut back oil production and embargoed (禁运)...
A.
Y
B.
N
C.
NG
【简答题】The death of the Queen __________ the end of an era. (credit sound mark figure)
【单选题】What does the title “End of an Era” indicate according to this passage?
A.
The US Federal Reserve will stop borrowing money to individuals.
B.
The Great Recession will end after a long-drawn period.
C.
The interest rates will stop going higher.
D.
The US Federal Reserve will stop service.
【单选题】Steve Jobs is one of the persons founded Apple Computer Company. His death marked the end of an era (时代).
A.
whose
B.
who
C.
which
D.
whom
【判断题】9)( ) The end of the Hellenistic Era was marked by the defeat of Anthony and Cleopatra in the battle of Actium.
A.
正确
B.
错误
【简答题】将奇数或偶数波带遮挡住的光阑称为波带片。证明:(1)波带片有一个类似普通透镜的成像公式;(2)若f是波带片的焦距,相应决定一个主焦点,则在 处尚有一系列次焦点。
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