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光纤是一种较常见的传输介质,呈圆柱状,由 、 和 组成。
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皮皮学刷刷变学霸
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【单选题】--How often do you drop your English teacher a line? ---________. But usually once a week.
A.
As usual
B.
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C.
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D.
Have no idea
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