【单选题】
光缆按敷设方式可分为管道光缆、（ ）、架空光缆和水底光缆等.___
A. 绞式光缆
B. 直埋光缆
C. 室外光缆
D. 单模光缆
E.
F.
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答案
B
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1___
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4___
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3___
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4___
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3___
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4___
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1___
A. About an hour.
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D. Over 10 percent of Americans spend more than 90 minutes getting to work.
