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问题
单项选择题
成数方差取最大值的条件是成数等于()。
A.0
B.1
C.0.5
D.0.25
答案
参考答案:
C
选择题
We were told that light _____ much faster than sound.
A. travels
B. traveled
C. was
D. travel
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问答题 简答题
回流流量过大有何缺点?
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