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问题
单项选择题
今后数据通信的发展方向是()
A.模拟传输
B.数字传输
C.模拟数据
D.数字数据
答案
参考答案:B
解答题
计划在一条路的一边栽26棵树,它们的间隔是4米,现在要改为栽21棵树,间隔应改为几米?
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选择题
Every year ________ tourists come to the island. ________ them is about one million.
A. a number of, A number of
B. the number of, A number of
C. a number of, The number of
D. the number of, The number of
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