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问题
单项选择题
光纤通信的短波长传输窗口是（）μm。
A.0.65
B.0.85
C.1.31
答案
参考答案：
B
选择题
— What does your father do?
— ______.
A. He's old.
B. He's thirsty (口渴).
C. He likes me.
D. He's a cook.
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名词解释
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