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【简答题】
最适合于DWDM系统使用的光纤是（），因为该光纤的色散系数较小，衰耗系数与其他类型的光纤相差无几，而且能够有效抑制四波混频效应。
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举一反三
【简答题】横线里最大能填几？ ______×2＜15 9×______＜60 5×______＜44．
【简答题】横线里最大能填几？ ______×6＜49 8×______＜63 ______×5＜44．
【简答题】my3+（133+44）=（my3+______）+44．
【简答题】 Passage 2 When people have more money than they need for ordinary ( 平常的 ) things, they sometimes spend their spare money in traveling and seeing other parts of the world. European ( 欧洲的 ) people go ...
【简答题】Five students went out for a one-week trip in the countryside. When they returned, the group leader wrote a report about each student. _ A. He was getting on very well until he hurt his foot on the ...
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