绞合型光缆中所用的光纤有紧包光纤,没有松包光纤。()

绞合型光缆中所用的光纤有紧包光纤,没有松包光纤。()

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The Chief Officer estimated the broken space ______ 3 500 cubic feet.A.atB.byC.withD.in

The Chief Officer estimated the broken space ______ 3 500 cubic feet.A.atB.byC.withD.in

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He as well as my sister ______ a student of English. A. is B. am C. are D. be

He as well as my sister ______ a student of English. A. is B. am C. are D. be

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光时域反射测量的主要目的是测定待测光纤的“定向散射脉冲响应”。()

光时域反射测量的主要目的是测定待测光纤的“定向散射脉冲响应”。()

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