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【简答题】
我国长途网光缆数字线路系统HRDS（）的长度分别为420km或280km，中继网HRDS的长度为50km。
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【单选题】Why do local people in Seattle seldom carry an umbrella?
A.
They drive most of the time.
B.
The rain is usually very light.
C.
They have got used to the rain.
D.
The rain comes mostly at night.
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A.
正确
B.
错误
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