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【单选题】
下列程序段的时间复杂度为（ ）。 i=1; while(i<=n) i=i*3;A.
O （ 3n ）
B.
O （ n ）
C.
O （ n 2 ）
D.
O （ log 3 n ）
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反馈参考答案：
举一反三
【单选题】He is generally considered _____ the first computer.
A.
to invent
B.
to have invented
C.
having invented
D.
inventing
【判断题】Zheng He was considered the first navigator to have traveled around the world in history.
A.
正确
B.
错误
【单选题】He is generally considered _____ the first computer. [ ]
A.
to invent
B.
inventing
C.
to have invented
D.
having invented
【判断题】Zheng He was considered the first navigator to have traveled around the world in history.
A.
正确
B.
错误
【单选题】First he considered the job of letters as a way of making a living, but as time went by, he developed a great passion for it.
A.
characters
B.
epistle
C.
writing
D.
mails
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