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【简答题】
光纤的损耗主要包括：（）、散射损耗和弯曲损耗，决定光纤衰减常数的损耗通常是前两种。
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举一反三
【单选题】What happened after Lincoln's assassination?
A.
The Civil War ended
B.
The Thirteenth Amendment became law
C.
Andrew Johnson was killed
D.
More states secreded from the Union
【单选题】What happened after the Tubbs Fire?
A.
Mr. Guthrie stopped talking about climate change.
B.
Mr. Guthrie started the group Schools for Action.
C.
Mr. Guthrie decide to become a teacher in California.
D.
Mr. Guthrie was happy with changes Congress made.
【单选题】What happened after Oliver Cromwell’s death?
A.
Protectorate Parliament was dissolved.
B.
Rump Parliament was recalled.
C.
Restoration of the monarchy.
D.
Start of the Third English Civil War.
【单选题】What happened after the Wright brothers’success?
A.
People carried out a systematic study on pigeons．
B.
People studied more animals and plants to develop the airplane．
C.
People could fly their airplane for fun．
D.
People kept their airplane at a French gallery．
【单选题】What happened after the WrightBrothers’success?
A.
People Carried out a systematic study on pigeons．
B.
People Could fly their airplane for fun．
C.
People kept their airplane at a French gallery．
D.
People studied more animals and plants todevelop the airplane．
【单选题】What happened after the Cromwell’s death?
A.
Protectorate Parliament was dissolved.
B.
Rump Parliament was recalled.
C.
Restoration of the monarchy.
D.
Beginning of the Third English Civil War.
【简答题】与哮喘发病关系最密切的脏腑是（ ）
【简答题】What happened after the message of seeing a Vermivora chrysoptera was put on the network?
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